获取响应数据 - 设置字符响应类型 - 《JAVA学习》

常见的字符型响应类型：
resp.setContentType(“text/html”)
设置响应类型为文本型，内容含有html字符串，是默认的响应类型
resp.setContentType(“text/plain”)
设置响应类型为文本型，内容是普通文本。
resp.setContentType(“application/json”)
设置响应类型为JSON格式的字符串。

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
/**
 * 设置字符型响应
 */
public class ResponseCharacterServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req, resp);
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //设置响应类型
        resp.setContentType("text/plain");
        PrintWriter printWriter = resp.getWriter();
        printWriter.println("<!DOCTYPE html>");
        printWriter.println("<html lang=en>");
        printWriter.println("<head>");
        printWriter.println("<meta charset=UTF-8>");
        printWriter.println("<title>Document</title>");
        printWriter.println("</head>");
        printWriter.println("<body>");
        printWriter.println("<font color=blue>HelloWorld</font>");
        printWriter.println("</body>");
        printWriter.println("</html>");
        printWriter.flush();
        printWriter.close();
    }
}