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  • 中文乱码处理

    什么情况下发生中文乱码?

    1.表单提交

    a.post方式

    b.get方式

    2.超链接(与get提交一样)

    3.setRedirect发生乱码

    1.表单提交

    a.post方式

    myform.html

    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    <h1>我的表单</h1>
    <form action="/encoding/TestServlet"  method="post"/>
    <input type="text" name="username"/><br/>
    <input type="submit" value="提交"/>
    </body>
    </html>
    View Code

    TestServlet.java

    package com.hsp;
    
    import java.io.IOException;
    import java.io.PrintWriter;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /**
     * Servlet implementation class TestServlet
     */
    @WebServlet("/TestServlet")
    public class TestServlet extends HttpServlet {
        private static final long serialVersionUID = 1L;
           
        /**
         * @see HttpServlet#HttpServlet()
         */
        public TestServlet() {
            super();
            // TODO Auto-generated constructor stub
        }
    
        /**
         * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
         */
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            // TODO Auto-generated method stub
            PrintWriter out=response.getWriter();
            String u=request.getParameter("username");
            System.out.println("u="+u);
        }
    
        /**
         * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
         */
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            // TODO Auto-generated method stub
            this.doGet(request, response);
        }
    
    }
    View Code

    加上一句:request.setCharacterEncoding("utf-8");

    b.get方式提交

    3.setRedirect发生乱码

    Wel.java

    package com.hsp;
    
    import java.io.IOException;
    import java.io.PrintWriter;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /**
     * Servlet implementation class wel
     */
    @WebServlet("/wel")
    public class Wel extends HttpServlet {
        private static final long serialVersionUID = 1L;
           
        /**
         * @see HttpServlet#HttpServlet()
         */
        public Wel() {
            super();
            // TODO Auto-generated constructor stub
        }
    
        /**
         * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
         */
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            // TODO Auto-generated method stub
            PrintWriter out=response.getWriter();
            String u=request.getParameter("yy");
            System.out.println("yy="+u);
        }
    
        /**
         * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
         */
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            // TODO Auto-generated method stub
            this.doGet(request, response);
        }
    
    }
    View Code

    TestServlet.java

    package com.hsp;
    
    import java.io.IOException;
    import java.io.PrintWriter;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /**
     * Servlet implementation class TestServlet
     */
    @WebServlet("/TestServlet")
    public class TestServlet extends HttpServlet {
        private static final long serialVersionUID = 1L;
           
        /**
         * @see HttpServlet#HttpServlet()
         */
        public TestServlet() {
            super();
            // TODO Auto-generated constructor stub
        }
    
        /**
         * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
         */
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            // TODO Auto-generated method stub
            request.setCharacterEncoding("utf-8");
            PrintWriter out=response.getWriter();
            String u=request.getParameter("username");
            System.out.println("u="+u);
            response.sendRedirect("/encoding/wel?yy="+u);
        }
    
        /**
         * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
         */
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            // TODO Auto-generated method stub
            this.doGet(request, response);
        }
    
    }
    View Code

     // String u= new String(request.getParameter("username").getBytes("ios-8859"),"utf-8");

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  • 原文地址:https://www.cnblogs.com/helloworld2019/p/10995084.html
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