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Day03【Response】设置响应头


response-设置响应头

  • (1)响应头是什么?
    响应头是一组键值对
  • (2)设置响应头有什么用?
    1)设置自己的键值对 name:jack
    2)修改系统已经存在的键值对
  • (3)设置方法

void setHeader(String name, String value)
//设置响应头的名字:Content-Type的值
void setHeader("Content-Type", String value)
void setContentType(String type)
//设置响应头,5秒钟之后,页面自动跳转到/day14login/index.html
response.setHeader("Refresh", "5;url=/day14login/index.html");
setHeader("Content-Disposition", String value)

src\com\wzx\pack02_sethead\Demo02SetHeadServlet.java

@WebServlet("/set_head")
public class Demo02SetHeadServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

}

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

//1:在响应头里面添加自己定义的key-value
response.setHeader("name","jack");
response.setHeader("gf","rose");

//2:修改key-value的值
//Content-Type: text/html;charset=utf-8
//response.setHeader("Content-Type","text/html;charset=utf-8");

response.setContentType("text/html;charset=utf-8");

response.getWriter().println("中国");

}
}

response-重定向**

  • (1)什么叫重定向?
    两次请求,两次响应
  • Day03【Response】设置响应头_tomcat

浏览器访问一个Servlet1,Servlet1没有我想要的资源,Servlet1让浏览器找Servlet2

  • (2)重定向的核心
    响应码302
    响应头Location
  • 案例
    src\com\wzx\pack03_redirect\Demo01Servlet.java
    编写重定向的代码,使用了两种方式,要求掌握第二种

@WebServlet("/demo01")
public class Demo01Servlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//我没有资源 你访问Servlet2
//设置重定向的参数 302 Location

//1:设置302
//response.setStatus(302);
//2:设置Location
//response.setHeader("Location","/web01_reponse/demo02");

response.sendRedirect("/web01_reponse/demo02");
}
}

src\com\wzx\pack03_redirect\Demo02Servlet.java
当前只是一个正常的Servlet

@WebServlet("/demo02")
public class Demo02Servlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//我有资源
System.out.println("demo02");
}
}


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