Response输出字符数据和Response输出字节数据

Response输出字符数据

步骤：

　　1.获取字符输出流

　　2.输出数据

@WebServlet("/responseD3")
public class ResponseD3 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //获取字符出出流
        PrintWriter pw = response.getWriter();
        //输出数据
        //pw.write("<h1>hello Response</h1>");
        pw.write("<h1>你好 Response</h1>");
    }

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

 

 出现中文乱码

乱码原因：编解码使用的字符集不一致

　　1.PrintWriter 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

设置编码，是在获取流之前进行设置的

@WebServlet("/responseD3")
public class ResponseD3 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //告诉浏览器，服务器发送的消息体数据的编码。建议使用该编码解码
        //response.setHeader("content-type","text/html;charset=utf-8");
        
        //简单形式
        response.setContentType("text/html;charset=utf-8");


        //获取字符出出流
        PrintWriter pw = response.getWriter();
        //输出数据
        //pw.write("<h1>hello Response</h1>");
        pw.write("<h1>你好 Response</h1>");
    }

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

推荐使用简单形式

Response输出字节数据

步骤：

　　1.获取字节输出流

　　2.输出数据

@WebServlet("/responseD4")
public class ResponseD4 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //简单形式
        response.setContentType("text/html;charset=utf-8");
        //获取字节输出流
        ServletOutputStream sos = response.getOutputStream();
        //输出数据
        sos.write("hello".getBytes("utf-8"));
    }

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

 

搜索

复制