getOutputStream() 和 getWriter()完成简单的发送相应消息体

1. getOutputStream()

该方法所获得的的字节流对象为ServletOutputStream类型, 由于ServletOutputStream是OutputStream的子类，它可以直接输出字节组中的二进制数据

通过servlet快速创建类

package com.czn.response;

import java.io.IOException;
import java.io.OutputStream;

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

@WebServlet("/sendMessage")
public class sendMessage extends HttpServlet {
	private static final long serialVersionUID = 1L;

    public sendMessage() {
        super();
    }

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String data = "Message";
		// 获取字节流输出流对象
		OutputStream out = response.getOutputStream();
		out.write(data.getBytes());//输出信息
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}
}

2. getWriter()

该方法所获取的字符输出对象为PrintWriter,可以直接输出字符文本内容

package com.czn.response;

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;


@WebServlet("/sendMessage02")
public class sendMessage02 extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    public sendMessage02() {
        super();
    }

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String data = "Message2";
		//获取字符输出流对象
		PrintWriter out = response.getWriter();
		out.write(data);//输出信息
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}

}