web项目获取资源文件
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1.首先上目录结构：
2.部署到tomcat，在servlet中测试，测试代码：
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package test;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.Properties;
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import java.util.ResourceBundle;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import utils.ReadFile;
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import utils.readFile.SysConfig;
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/**
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* Servlet implementation class testEvery
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*/
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@WebServlet("/testEvery")
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public class testEveryServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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/**
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* @see HttpServlet#HttpServlet()
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*/
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public testEveryServlet() {
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super();
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// TODO Auto-generated constructor stub
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}
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/**
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* 访问url：http://localhost:8080/demoProj/testEveryServlet
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*/
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/**
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* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
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*/
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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// TODO Auto-generated method stub
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response.getWriter().append("Served at: ").append(request.getContextPath());
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String path = request.getSession().getServletContext().getRealPath("/config/sysconfig.properties");
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System.out.println("doGet读取到的/WEB-INF/config/sysconfig.properties:path:"+path);
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String url = request.getSession().getServletContext().getRealPath("/WEB-INF/config/config.properties");
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System.out.println("doGet读取到的/WEB-INF/config/config.properties:url:"+url);
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/**
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* 结果：
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* doGet:path:D:\tomcat7\wtpwebapps\demoProj\config\sysconfig.properties
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* doGet:url:D:\tomcat7\wtpwebapps\demoProj\WEB-INF\config\config.properties
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*/
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//只能获取src下面的
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InputStream in = this.getServletContext().getResourceAsStream("/WEB-INF/classes/config/test.properties");
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Properties prop = new Properties(); //map
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prop.load(in);
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String url1 = prop.getProperty("url");
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System.out.println("获取到的url1:"+url1);//获取到的url1:www.baidu.com
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//不可获取
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InputStream in2 = this.getServletContext().getResourceAsStream("/WEB-INF/config.properties");
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Properties prop2 = new Properties(); //map
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prop.load(in2);
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String url2 = prop2.getProperty("url");
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System.out.println("获取到的url2:"+url2);//获取到的url2:null
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//不可获取
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InputStream in3 = this.getServletContext().getResourceAsStream("/webcontent.properties");
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Properties prop3 = new Properties(); //map
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prop.load(in3);
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String url3 = prop3.getProperty("url");
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System.out.println("获取到的url3:"+url3);//获取到的url3:null
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//不可获取
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InputStream in4 = this.getServletContext().getResourceAsStream("/config/wcc.properties");
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Properties prop4 = new Properties(); //map
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prop.load(in4);
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String url4 = prop4.getProperty("url");
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System.out.println("获取到的url4:"+url4);//获取到的url4:null
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// 读取src下config包中的testJava.java
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// InputStream in = ReadFile.class.getResourceAsStream("/config/testJava.java");//in为null
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// byte[] a=new byte[100];
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// in.read(a, 0, 900);
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// System.out.println("读取src下config包中的testJava.java的输入流in的内容toString："+in.toString());
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// System.out.println("读取到的a:"+a);
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String fileName3 = ReadFile.class.getResource("/config/test.properties").getFile();
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System.out.println("读取src下config包中的test.properties:"+fileName3);
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//输出：读取src下config包中的test.properties:/D:/tomcat7/wtpwebapps/demoProj/WEB-INF/classes/config/test.properties
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// in.close();
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// 读取src下 基名为myproperties的properties文件，获取其中name配置值
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String value = ResourceBundle.getBundle("myproperties").getString("name");
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System.out.println("获取到的myproperties.properties的值value："+value);
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//输出：获取到的myproperties.properties的值value：myname
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// 读取src下myproperties.properties
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InputStream in1 = ReadFile.class.getResourceAsStream("/myproperties.properties");
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Properties properties = new Properties();
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properties.load(in1);
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String value2 = properties.getProperty("name"); // 获得name属性
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System.out.println("获取到的myproperties.properties的值value2："+value2);
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//获取到的myproperties.properties的值value2：myname
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//读取src下的
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String sensitiveWordsServerPath1 = SysConfig.getSysParam("sensitiveWords_server_path1");
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System.out.println("获取的sensitiveWordsServerPath1:"+sensitiveWordsServerPath1);
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//获取的sensitiveWordsServerPath1:/datacms/htdocs/html/cctv/sensitiveWords/sws.xlsx
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//读取src下的
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String pp = prop("sensitiveWords_server_path1");
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System.out.println("pp:"+pp);//pp:/datacms/htdocs/html/cctv/sensitiveWords/sws.xlsx
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}
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public String prop(String url){
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InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("config/sysconfig.properties");
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Properties p = new Properties();
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try {
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p.load(inputStream);
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} catch (Exception e) {
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e.printStackTrace();
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}
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System.out.println("p:"+p);
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return p.getProperty(url);
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}
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/**
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* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
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*/
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protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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// TODO Auto-generated method stub
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doGet(request, response);
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String path = request.getSession().getServletContext().getRealPath("/config/sysconfig.properties");
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System.out.println("doPost:path:"+path);
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}
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}
网上大量的读取配置文件的都是从src目录下，只有以下是从WebContent目录下读取的：
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String path = request.getSession().getServletContext().getRealPath("/config/sysconfig.properties");
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System.out.println("doGet读取到的/WEB-INF/config/sysconfig.properties:path:"+path);
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String url = request.getSession().getServletContext().getRealPath("/WEB-INF/config/config.properties");
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System.out.println("doGet读取到的/WEB-INF/config/config.properties:url:"+url);
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/**
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* 结果：
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* doGet:path:D:\tomcat7\wtpwebapps\demoProj\config\sysconfig.properties
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* doGet:url:D:\tomcat7\wtpwebapps\demoProj\WEB-INF\config\config.properties
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*/
另：目前还没发现可以不启动tomcat，直接从当前项目WebContent目录下读取配置文件的简便方法。（不是从硬盘目录下，有些方法很复杂），有解决方法的同学请贡献出来。
参考：
http://blog.csdn.net/qhwc2009/article/details/45824815
http://blog.csdn.net/wjl_mgqs/article/details/7554741
http://www.cnblogs.com/duoting/p/4141044.html
http://blog.csdn.net/mar_ljh/article/details/39693979
附上SysConfig.java
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package utils.readFile;
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import java.io.FileOutputStream;
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import java.io.OutputStream;
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import java.util.Enumeration;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Properties;
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import org.apache.log4j.Logger;
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import com.alibaba.fastjson.JSONArray;
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import com.alibaba.fastjson.JSONObject;
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public class SysConfig {
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private static Logger logger = Logger.getLogger(SysConfig.class);
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/**
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* 将本类定义为singleton类
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*/
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private SysConfig(){
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}
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private static SysConfig mConfig= new SysConfig();
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private Map<String,String> params = null;
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private static String CONFIG_FILE="/config/sysconfig.properties";
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private static String CONFIG_FILE_PATH = SysConfig.class.getClassLoader().getResource("").getPath().substring(1) + CONFIG_FILE;
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public static String getSysParam(String param) {
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return getAllParams().get(param);
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}
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public static Map<String,String> getAllParams() {
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synchronized(mConfig){
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if(mConfig.params==null){
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mConfig.readConfig();
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}
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}
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System.out.println("mConfig.params:"+mConfig.params);
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return mConfig.params;
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}
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/**
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* 重载配置文件
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*/
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public static void reloadConfig(JSONArray array) {
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try{
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Properties props = new Properties();
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for(int i=0;i<array.size();i++){
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JSONObject o = array.getJSONObject(i);
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String key = o.keySet().iterator().next();
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String value = o.getString(key);
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mConfig.params.put(key, value);
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props.setProperty(key, value);
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}
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String configFilePath = CONFIG_FILE_PATH;
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if(!isLocal()){
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configFilePath = "/" + CONFIG_FILE_PATH;
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}
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OutputStream out = new FileOutputStream(configFilePath);
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props.store(out, "update");
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}catch(Exception e){
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logger.info("may error config");
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}
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}
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private void readConfig() {
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try {
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Properties props = new Properties();
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props.load(SysConfig.class.getResourceAsStream(CONFIG_FILE));
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this.propertisToCache(props);
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} catch (Exception e) {
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logger.info("may error config");
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}
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}
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/**
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* 将配置写入内存
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* @param properties
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*/
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private void propertisToCache(Properties props){
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mConfig.params = new HashMap<String,String>();
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Enumeration e = props.propertyNames();
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while(e.hasMoreElements()) {
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String key = (String)e.nextElement();
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String value = props.getProperty(key);
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params.put(key, value);
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}
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if(isLocal()) {
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params.put("root_path", params.get("root_path_local"));
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params.put("root_path_issue_temp", params.get("root_path_issue_temp_local"));
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params.put("root_path_issue", params.get("root_path_issue_local"));
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} else {
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params.put("root_path", params.get("root_path_server"));
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params.put("root_path_issue_temp", params.get("root_path_issue_temp_server"));
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params.put("root_path_issue", params.get("root_path_issue_server"));
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}
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}
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/**
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* 判断系统类型
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* @return：true为windows系统
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*/
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public static boolean isLocal() {
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if (System.getProperty("os.name").contains("Windows")) {
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return true;
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}
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logger.info("os is : " + System.getProperty("os.name"));
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return false;
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}
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}
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