重定向-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_45520541/article/details/113360413

本文详细介绍了如何在Java Servlet中使用`sendRedirect`进行请求重定向，并对比了与转发的区别。通过实例代码展示了`doGet`和`doPost`方法的响应操作，以及一个简单的表单提交和hello页面的处理。重点讲解了3xx状态码的含义和重定向与转发在实际应用中的应用场景。

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代码实现

public class req extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.sendRedirect("/mavenIDEA_war/hello");
    }

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

核心代码：resp.sendRedirect("/mavenIDEA_war/hello");

// hello页面java代码如下
public class hello extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        PrintWriter out = resp.getWriter();
        resp.setContentType("text/html");
        out.print("<h1>it is a test</h1>");
    }

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

form表单如下

<html>
<body>
<h2>Hello World!</h2>
<form action="./req" method="get">
    username:
    <input type="text" name= "username">
    password:
    <input type="password" name = "password">
    <input type="submit">
</form>
</body>
</html>

效果在这里插入图片描述