服务器端代码

package com.easyui.controller;

import sun.misc.BASE64Encoder;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.Base64;

/**
 * Created by baich on 2016/4/10.
 */
@WebServlet(name = "MenuController", value = "MenuController")
public class MenuController extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html");
        PrintWriter writer = response.getWriter();
        File file = new File("logo.png");
        InputStream is = new FileInputStream(file);
        ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
        byte[] buff = new byte[100];
        int rc = 0;
        while ((rc = is.read(buff, 0, 100)) > 0) {
            swapStream.write(buff, 0, rc);
        }
        byte[] in2b = swapStream.toByteArray();
        BASE64Encoder en = new BASE64Encoder();
        String result = en.encode(in2b);
        System.out.println(result);
        writer.write(result);
        writer.flush();
        writer.close();
    }
}



页面代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="common/jquery-easyui-1.4.5/jquery.min.js"></script>
</head>
<body>
    <img id="img" src="" alt="222222222222">

    <script>
        $.ajax({ // 这里使用到Jquery的ajax方法
            type: "POST",
            dataType: "text",
            async: false,
            url: "/easyui/MenuController",
            success: function (data) {
                var dt = data;
                $("#img").attr("src", "data:image/png;base64," + data);
            }
        });
    </script>
</body>
</html>


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