向客户端输出中文数据

小灰灰 2022-05-16 06:18 261阅读 0赞

## 需要注意的是OutputStream和write的冲突问题 ##

## 1、使用OutputStream输出中文数据 ##

package cn.itcast.response;
    
    import java.io.IOException;
    import java.io.OutputStream;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    //用outputStream输出中文数据的问题
    public class ResponseDemo1 extends HttpServlet {
        
    
        public void doGet(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
            test4(response);
        }
    
    
        //写数字给浏览器的问题
        public void test4(HttpServletResponse response) throws IOException{
            response.getOutputStream().write((120+"").getBytes("UTF-8"));
        }
    
    
        //用<meta>  模似一个http响应头，控制浏览器以UTF-8打开数据
        public void test3(HttpServletResponse response) throws IOException{
    
            response.getOutputStream().write("<meta http-equiv='content-type' content='text/html;charset=UTF-8'>".getBytes());
            String data = "中国";
            OutputStream out = response.getOutputStream();
            out.write(data.getBytes("UTF-8"));
    
        }
    
        //输出UTF-8的数据，有问题,需要控制浏览器以utf-8打开
        public void test2(HttpServletResponse response) throws IOException{
    
            //<meta>  模似一个http响应头
            //使用http协议控制浏览器以utf-8打开下面发送的数据
            response.setHeader("content-type", "text/html;charset=UTF-8");
    
            String data = "中国";
            OutputStream out = response.getOutputStream();
            out.write(data.getBytes("UTF-8"));
    
        }
    
        //输出gb2312的数据，没有问题
        public void test1(HttpServletResponse response) throws IOException{
    
            String data = "中国";
            OutputStream out = response.getOutputStream();
            out.write(data.getBytes());
    
        }
    
    
    
        public void doPost(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
            doGet(request, response);
        }
    
    }

## 2、使用writer输出中文数据 ##

package cn.itcast.response;

import java.io.IOException;  
import java.io.PrintWriter;

import javax.servlet.ServletException;  
import javax.servlet.http.HttpServlet;  
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;

//用Writer输出中文数据  
public class ResponseDemo2 extends HttpServlet \{

public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        test1(response);
    }
    
    public void test2(HttpServletResponse response) throws IOException{
        //这句话调用后，相当于把response.setCharacterEncoding("UTF-8");  也设好了
        response.setContentType("text/html;charset=UTF-8");
    
        String data = "中国";
        PrintWriter writer = response.getWriter();
        writer.write(data);
    }
    
    public void test1(HttpServletResponse response) throws IOException{
    
        //更改response的码表,通知服务器用UTF-8码表去取response中的数据，然后写给客户机
        response.setCharacterEncoding("UTF-8");  
        //通知浏览器以UTF-8码表打开回送的数据
        //response.setHeader("content-type", "text/html;charset=UTF-8");
        response.setContentType("text/html;charset=UTF-8");
    
        String data = "中国";
        PrintWriter writer = response.getWriter();
        writer.write(data);
    }
    
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }