案例-服务器输出字符数据到浏览器和服务器输出字节数据到浏览器

案例-服务器输出字符数据到浏览器

步骤：

1. 获取字符输出流
2. 输出数据

注意:

• 乱码问题
  1. PrintWiter pw= response.getWriter();获取的流的默认编码是ISO-8859-1
  2. 设置该流的默认编码
  3. 告诉浏览器响应体使用的编码　

java代码

package com.bai.Servlet01;


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.IOException;
import java.io.PrintWriter;

@WebServlet("/ResponseDemo03")
public class ResponseDemo03 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        //获取流对象之前 设置流的默认编码：ISO-8859-1 设置为utf-8
        resp.setCharacterEncoding("utf-8");

        //告诉浏览器 服务器发生的消息体数据的编码 建议浏览器使用改编码解码
        resp.setHeader("content-type","text/html;charset=utf-8");

        //简单的形式 设置编码
        resp.setContentType("text/html;charset=utf-8");

        // 
        PrintWriter pw = resp.getWriter();
        //输出数据
        pw.write("<h1>Hello response</h1>");
        //输出数据
        pw.write("Hello response");
        pw.write("\n");
        //输出数据
        pw.write("你好 response");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

运行结果

 

 

 服务器输出字节数据到浏览器

1. 获取字节输出流
2. 输出数据

 java代码

package com.bai.Servlet01;


import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/ResponseDemo04")
public class ResponseDemo04 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html;charset=utf-8");

        //获取字节输出流
        ServletOutputStream sos = resp.getOutputStream();
        //输出数据
        sos.write("你好".getBytes("utf-8"));
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}