java后端发送请求

package com.ty.mapapisystem.util;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.ty.mapapisystem.controller.LoginController;

import net.sf.json.JSONObject;

public class DynamicReadConfig {
/**
* 获取配置文件的属性
* @param configPath 配置文件路径
* @param propertyName 要获取该属性的值
* @return 读取的属性值
* @throws Exception
* @throws ConfigurationException 异常向上抛出，有调用该方法的用户进行处理
*/
public static Log log=LogFactory.getLog(DynamicReadConfig.class);
public static String getConfigProperty(String configPath,String propertyName) {
InputStream in = null;
try {
in = new FileInputStream(configPath);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Properties prop = new Properties();
try {
prop.load(in);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String s = prop.getProperty(propertyName);
return s;
}

public static String startPost(String url,Map<String,Object> map){
StringBuffer sb = new StringBuffer();
for(Map.Entry<String , Object> data:map.entrySet()){
sb.append(data.getKey()+"="+data.getValue()+"&");
}
String rtn = sb.toString().substring(0, sb.toString().length()-1);
return sendPost(url,rtn);
}
public static String sendPost(String url, String param) {

PrintWriter out = null;

BufferedReader in = null;

String result = "";

try {

URL realUrl = new URL(url);

// 打开和URL之间的连接

URLConnection conn = realUrl.openConnection();

// 设置通用的请求属性

conn.setRequestProperty("accept", "*/*");

conn.setRequestProperty("connection", "Keep-Alive");

conn.setRequestProperty("user-agent",

"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

// 发送POST请求必须设置如下两行

conn.setDoOutput(true);

conn.setDoInput(true);

// 获取URLConnection对象对应的输出流

out = new PrintWriter(conn.getOutputStream());

// 发送请求参数

out.print(param);

// flush输出流的缓冲

out.flush();

// 定义BufferedReader输入流来读取URL的响应

in = new BufferedReader(

new InputStreamReader(conn.getInputStream(),"utf-8"));

String line;

while ((line = in.readLine()) != null) {

result += line;

}

} catch (Exception e) {

log.error("发送 POST 请求出现异常！",e);

e.printStackTrace();

}

//使用finally块来关闭输出流、输入流

finally{

try{

if(out!=null){

out.close();

}

if(in!=null){

in.close();

}

}

catch(Exception ex){

ex.printStackTrace();

}

}

return result;

}

public static String oauth(String account,String passWord) throws Exception {
String url = "";
String id = "";
String secret = "";
String type = "";
String scope = "";
String configPro =DynamicReadConfig.class.getResource("/").getPath() + "/oauthConfig.properties";//"E:\\MapAPISystem(1)\\MapAPISystem\\src\\oauthConfig.properties";
try {
url = DynamicReadConfig.getConfigProperty(configPro, "login.url");
id = DynamicReadConfig.getConfigProperty(configPro, "login.id");
secret = DynamicReadConfig.getConfigProperty(configPro, "login.secret");
type = DynamicReadConfig.getConfigProperty(configPro, "login.type");
scope = DynamicReadConfig.getConfigProperty(configPro, "login.scope");
} catch (Exception e) {
e.printStackTrace();
}
Map<String, Object> map = new HashMap<String, Object>();
map.put(id.split(";")[0], id.split(";")[1]);
map.put(secret.split(";")[0], secret.split(";")[1]);
map.put(type.split(";")[0], type.split(";")[1]);
map.put("username", account);
map.put("password", passWord);
map.put(scope.split(";")[0], scope.split(";")[1]);
String str = DynamicReadConfig.startPost(url, map);
if(str == ""){
return "";
}
String ToKen = "";
JSONObject json = JSONObject.fromObject(str);

ToKen=json.getString("access_token");//String.valueOf(map1.get("access_token"));
// }
return ToKen;
}

//
// public static void main(String[] args) throws Exception {
// String str = DynamicReadConfig.oauth("gh", "123");
// System.out.println(str);
// }
}