【Struts 文件上传下载】

RegisterAction

package k.action;

import k.domain.User;
import k.form.UserForm;
import k.service.UserService;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;
import org.apache.struts.upload.FormFile;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.UUID;

public class RegisterAction extends DispatchAction {
    public ActionForward fileUpload(ActionMapping mapping, ActionForm form,
                                    HttpServletRequest request, HttpServletResponse response) throws Exception {
        UserForm dynaForm = (UserForm) form;
        String userName = dynaForm.getUserName();
        FormFile formFile = dynaForm.getMyPhoto();
        String oldFileName = formFile.getFileName();
        System.out.println("==" + userName + "==" + oldFileName + "==" + formFile.getFileSize());
        String path = this.getServlet().getServletContext().getRealPath("/file");

        File file = new File(path);
        if (!file.exists())
            file.mkdir();
        String newfileName = getNewFileName(oldFileName);
        String newpath = path + "\\" + newfileName;
        InputStream inputStream = null;
        FileOutputStream outputStream = null;
        byte[] bytes = new byte[1024];
        int len;
        try {
            inputStream = formFile.getInputStream();
            outputStream = new FileOutputStream(newpath);
            while ((len = inputStream.read(bytes)) > 0) {
                outputStream.write(bytes, 0, len);
            }
            User user = new User("", userName, formFile.getFileName(), newfileName);
            System.out.println(user);
            if (new UserService().addUser(user)) {
                return mapping.findForward("registerOk");
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (inputStream != null)
                inputStream.close();
            if (outputStream != null)
                outputStream.close();
        }
        return mapping.findForward("err");
    }

    private static String getNewFileName(String fileName) {
        int beginIndex = fileName.lastIndexOf(".");
        return UUID.randomUUID().toString() + fileName.substring(beginIndex, fileName.length());
    }

    public ActionForward getUserList(ActionMapping mapping, ActionForm form,
                                     HttpServletRequest request, HttpServletResponse response) throws Exception {
        UserService userService = new UserService();
        List<Map<String, Object>> userList = userService.getUserList();
        ArrayList<User> userArrayList = new ArrayList<>();
        for (Map<String, Object> item : userList) {
            String id = item.get("id").toString();
            String username = item.get("user_name").toString();
            String photo_old_name = item.get("photo_old_name").toString();
            String photo_new_name = item.get("photo_new_name").toString();
            User user = new User(id, username, photo_old_name, photo_new_name);
            userArrayList.add(user);
        }
        request.setAttribute("userList", userArrayList);
        return mapping.findForward("listUser");
    }

    public ActionForward downUserPhoto(ActionMapping mapping, ActionForm form,
                                       HttpServletRequest request, HttpServletResponse response) throws Exception {
        User user = new User();
        user.setId(request.getParameter("id"));
        UserService userService = new UserService();
        List<Map<String, Object>> userList = userService.getUser(user);

        String photo_old_name = userList.get(0).get("photo_old_name").toString();
        String photo_new_name = userList.get(0).get("photo_new_name").toString();
        String path = this.getServlet().getServletContext().getRealPath("/file");

        response.setContentType("text/html; charset=utf-8");
        String urlFileName = URLEncoder.encode(photo_old_name, "utf-8");
        response.setHeader("Content-Disposition", "attachment;filename=" + urlFileName);

        InputStream inputStream = null;
        OutputStream outputStream = null;
        try {
            inputStream = new FileInputStream(path + "\\" + photo_new_name);
            outputStream = response.getOutputStream();
            int len;
            byte[] bytes = new byte[1024];
            while ((len = inputStream.read(bytes)) > 0) {
                outputStream.write(bytes, 0, len);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (inputStream != null)
                inputStream.close();
            if (outputStream != null)
                outputStream.close();
        }
        return mapping.findForward("listUser");
    }
}

register.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Register</title>
</head>
<body>
<h1>注册页面</h1>
<form action="${APP_PATH}/register.do?action=fileUpload" method="post" enctype="multipart/form-data">
    名字：<input type="text" name="userName" value="11哈哈"> <br>
    头像： <input type="file" name="myPhoto"> <br>
    <input type="submit" value="submit"> <br>
</form>
</body>
</html>

listUser.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %>
<html>
<head>
    <title>error</title>
</head>
<body>
<h1>用户列表</h1>
<c:forEach items="${userList}" var="user">
    用户名：${user.userName}
    <img src="${APP_PATH}/file/${user.photoNewName}" width="300px">
    <a href="${APP_PATH}/register.do?action=downUserPhoto&id=${user.id}">点击下载</a>
    <br>
</c:forEach>
</body>
</html>

registerOk.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>注册成功</h1>
<a href="${APP_PATH}/register.do?action=getUserList">用户列表</a>
</body>
</html>

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>$Title$</title>
  </head>
  <body>
  <jsp:forward page="WEB-INF/jsp/register.jsp"></jsp:forward>
  </body>
</html>

struts-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"
        "http://struts.apache.org/dtds/struts-config_1_3.dtd">
<struts-config>
    <global-forwards>
        <forward name="err" path="/WEB-INF/jsp/err.jsp" redirect="false"></forward>
    </global-forwards>
    <form-beans>
        <form-bean name="userForm" type="k.form.UserForm">
            <form-property name="userName" type="java.lang.String"></form-property>
            <form-property name="myphoto" type="org.apache.struts.upload.FormFile"></form-property>
        </form-bean>
    </form-beans>
    <action-mappings>
        <action name="userForm" path="/register" parameter="action" type="k.action.RegisterAction"
                scope="request" attribute="userForm" input="index.jsp" validate="false">
            <forward name="registerOk" path="/WEB-INF/jsp/registerOk.jsp"></forward>
            <forward name="listUser" path="/WEB-INF/jsp/listUser.jsp"></forward>
        </action>
    </action-mappings>
</struts-config>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    <servlet>
        <servlet-name>action</servlet-name>
        <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
        <init-param>
            <param-name>config</param-name>
            <param-value>/WEB-INF/struts-config.xml</param-value>
        </init-param>
        <load-on-startup>2</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>action</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

    <filter>
        <filter-name>EncodingFilter</filter-name>
        <filter-class>k.filter.EncodingFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>EncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <listener>
        <display-name>StartSystemListener</display-name>
        <listener-class>k.filter.StartSystemListener</listener-class>
    </listener>
</web-app>

User

package k.domain;

public class User {
    private String id;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    private String userName;
    private String photoOldName;

    public User(String id, String userName, String photoOldName, String photoNewName) {
        this.id = id;
        this.userName = userName;
        this.photoOldName = photoOldName;
        this.photoNewName = photoNewName;
    }

    public String getPhotoNewName() {

        return photoNewName;
    }

    public void setPhotoNewName(String photoNewName) {
        this.photoNewName = photoNewName;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPhotoOldName() {
        return photoOldName;
    }

    public void setPhotoOldName(String photoOldName) {
        this.photoOldName = photoOldName;
    }

    private String photoNewName;

    public User() {
    }
}

EncodingFilter

package k.filter;

import javax.servlet.*;
import javax.servlet.http.HttpServlet;
import java.io.IOException;

public class EncodingFilter extends HttpServlet implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
                         FilterChain filterChain) throws IOException, ServletException {
        servletRequest.setCharacterEncoding("utf-8");
        servletResponse.setCharacterEncoding("utf-8");
        // System.out.println("========== set utf-8 ok ==========");
        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }
}

StartSystemListener

package k.filter;

import k.utils.WebHelper;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class StartSystemListener implements ServletContextListener {
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        //1.将项目上下文路径(request.getContextPath())放置到application域中.
        ServletContext application = sce.getServletContext();
        String app_path = application.getContextPath();
        application.setAttribute("APP_PATH", app_path);
        System.out.println("========== APP_PATH = " + app_path);
        WebHelper.setApp_Path(app_path);
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {

    }
}

UserForm

package k.form;

import org.apache.struts.action.ActionForm;
import org.apache.struts.upload.FormFile;

public class UserForm extends ActionForm {
    private String userName;
    private FormFile myPhoto;

    public UserForm() {
    }

    public UserForm(String userName, FormFile myPhoto) {

        this.userName = userName;
        this.myPhoto = myPhoto;
    }

    public String getUserName() {

        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public FormFile getMyPhoto() {
        return myPhoto;
    }

    public void setMyPhoto(FormFile myPhoto) {
        this.myPhoto = myPhoto;
    }
}

UserService

package k.service;

import k.domain.User;
import k.utils.JdbcUtils;

import java.util.List;
import java.util.Map;

public class UserService {
    public boolean addUser(User user) {
        String sql = "insert into user_photo (user_name,photo_old_name,photo_new_name) VALUES(?,?,?);";
        Object[] parms = new Object[]{user.getUserName(), user.getPhotoOldName(), user.getPhotoNewName()};
        int a1 = JdbcUtils.executeUpdate(sql, parms);
        return a1 == 1;
    }

    public List<Map<String, Object>> getUserList() {
        String sql = "SELECT id,user_name,photo_old_name,photo_new_name FROM user_photo;";
        List<Map<String, Object>> maps = JdbcUtils.executeQuery(sql);
        return maps;
    }

    public List<Map<String, Object>> getUser(User user) {
        String sql = "SELECT id,user_name,photo_old_name,photo_new_name FROM user_photo where id=?;";
        Object[] parms = new Object[]{user.getId()};
        List<Map<String, Object>> maps = JdbcUtils.executeQuery(sql, parms);
        return maps;
    }
}

JdbcUtils

package k.utils;

import java.sql.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public final class JdbcUtils {
    private static String url = "jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8";
    private static String user = "root";
    private static String password = "xxxxxx";

    public static void main(String[] args) {
        // String sql = "UPDATE `user` set money=money+10 WHERE `name` =? ";
        // Object[] parms = new Object[]{"name1"};
        // int a1 = executeUpdate(sql, parms);
        // System.out.println(a1);
        String sql = "select * from user";
        List<Map<String, Object>> list = executeQuery(sql, null);
        for (Map<String, Object> map : list) {
            for (String key : map.keySet()) {
                System.out.println("Key=" + key + "\t value=" + map.get(key));
            }
            System.out.println();
        }
    }

    public static List<Map<String, Object>> executeQuery(String sql) {
        return executeQuery(sql, null);
    }

    public static List<Map<String, Object>> executeQuery(String sql, Object[] parms) {
        Connection conn = null;
        PreparedStatement st = null;
        ResultSet rs = null;
        List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
        try {
            conn = JdbcUtils.getConnection();
            st = conn.prepareStatement(sql);
            if (parms != null && parms.length > 0) {
                for (int i = 0; i < parms.length; i++) {
                    st.setObject(i + 1, parms[i]);
                }
            }
            rs = st.executeQuery();
            ResultSetMetaData rsmd = rs.getMetaData();
            while (rs.next()) {
                Map<String, Object> map = new HashMap<>();
                for (int i = 0; i < rsmd.getColumnCount(); i++) {
                    String columnLabel = rsmd.getColumnLabel(i + 1);
                    Object columnValue = rs.getObject(columnLabel);
                    map.put(columnLabel, columnValue);
                }
                list.add(map);
            }

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            JdbcUtils.free(rs, st, conn);
        }
        return list;
    }

    public static int executeUpdate(String sql, Object[] parms) {
        int res = -1;
        Connection conn = null;
        PreparedStatement pst = null;
        ResultSet set = null;
        try {
            conn = getConnection();
            pst = conn.prepareStatement(sql);
            for (int i = 0; i < parms.length; i++) {
                pst.setObject(i + 1, parms[i]);
            }
            res = pst.executeUpdate();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            free(set, pst, conn);
        }
        return res;
    }

    private JdbcUtils() {
    }

    static {
        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            throw new ExceptionInInitializerError(e);
        }
    }

    public static Connection getConnection() throws SQLException {
        return DriverManager.getConnection(url, user, password);
    }

    public static void free(ResultSet rs, Statement st, Connection conn) {
        try {
            if (rs != null)
                rs.close();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (st != null)
                    st.close();
            } catch (SQLException e) {
                e.printStackTrace();
            } finally {
                if (conn != null) {
                    try {
                        conn.close();
                    } catch (SQLException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
}

WebHelper

package k.utils;

import java.util.UUID;

public class WebHelper {

    public static String getApp_Path() {
        return APP_PATH;
    }

    public static void setApp_Path(String appPath) {
        APP_PATH = appPath;
    }

    private static String APP_PATH = "";

    public static String getNewFileName(String fileName) {
        int beginIndex = fileName.lastIndexOf(".");
        return UUID.randomUUID().toString() + fileName.substring(beginIndex, fileName.length());
    }
}