Question

刚刚编写了一些代码，用于在spring mvc中将一个动作重定向并转发到另一个动作。还使用GET和POST完成了一些排列。

我的问题是当我们从一个带有@RequestMapping的动作重定向/前进到另一个带有@RequestMapping和@ResponseBody的动作时，事情是如何工作的。

以下是带有ajax脚本的控制器和jsp的代码片段。对于无法处理响应错误的方法，提到了评论。

@Controller
@RequestMapping(value = "/myMvc")
public class MyMvcController {

    @RequestMapping(value = "/home", method = RequestMethod.GET)
    public String home(Model map, HttpServletRequest req) {
        return "home";
    }

    @RequestMapping(value = "/action1", method = RequestMethod.POST)
    public @ResponseBody String action1(Model map, HttpServletRequest req) {

        return "Sending response body as POST";
    }

    @RequestMapping(value = "/action2", method = RequestMethod.GET)
    public @ResponseBody String action2(Model map, HttpServletRequest req) {

        return "sending response body as GET";
    }

    /*****action3 to action6 Redirect******/

    //POST to GET
    @RequestMapping(value = "/action3", method = RequestMethod.POST)
    public String action3(Model map, HttpServletRequest req) {

        return "redirect:/myMvc/action2";
    }

    //POST to POST
    @RequestMapping(value = "/action4", method = RequestMethod.POST)
    public String action4(Model map, HttpServletRequest req) {

        //will not execute 
        //Request method 'GET' not supported
        return "redirect:/myMvc/action1";
    }

    //GET to POST
    @RequestMapping(value = "/action5", method = RequestMethod.GET)
    public String action5(Model map, HttpServletRequest req) {

        //will not execute 
        //Request method 'GET' not supported
        return "redirect:/myMvc/action1";
    }

    //GET to GET
    @RequestMapping(value = "/action6", method = RequestMethod.GET)
    public String action6(Model map, HttpServletRequest req) {

        return "redirect:/myMvc/action2";
    }

    /*****action7 to action10 Forward******/

    //POST to GET
    @RequestMapping(value = "/action7", method = RequestMethod.POST)
    public String action7(Model map, HttpServletRequest req) {

        //will not execute 
        //Request method 'POST' not supported
        return "forward:/myMvc/action2";
    }

    //POST to POST
    @RequestMapping(value = "/action8", method = RequestMethod.POST)
    public String action8(Model map, HttpServletRequest req) {

        return "forward:/myMvc/action1";
    }

    //GET to POST
    @RequestMapping(value = "/action9", method = RequestMethod.GET)
    public String action9(Model map, HttpServletRequest req) {

        //will not execute 
        //Request method 'GET' not supported
        return "forward:/myMvc/action1";
    }

    //GET to GET
    @RequestMapping(value = "/action10", method = RequestMethod.GET)
    public String action10(Model map, HttpServletRequest req) {

        return "forward:/myMvc/action2";
    }
}

home.jsp文件

<button onclick="hitAction3()">hit action3</button><br><br>
    <button onclick="hitAction4()">hit action4</button><br><br>
    <button onclick="hitAction5()">hit action5</button><br><br>
    <button onclick="hitAction6()">hit action6</button><br><br>
    <button onclick="hitAction7()">hit action7</button><br><br>
    <button onclick="hitAction8()">hit action8</button><br><br>
    <button onclick="hitAction9()">hit action9</button><br><br>
    <button onclick="hitAction10()">hit action10</button><br><br>

<script>
    function hitAction3() {
        $.ajax({
                method:'POST',
                url: "${pageContext.request.contextPath}/myMvc/action3",
        }).done(function(data) {alert(data);});
    }

    function hitAction4() {
        $.ajax({
                method:'POST',
                url: "${pageContext.request.contextPath}/myMvc/action4",
        }).done(function(data) {alert(data);});
    }

    function hitAction5() {
        $.ajax({
                method:'GET',
                url: "${pageContext.request.contextPath}/myMvc/action5",
            }).done(function(data) {alert(data);});
    }

    function hitAction6() {
        $.ajax({
                method:'GET',
                url: "${pageContext.request.contextPath}/myMvc/action6",
            }).done(function(data) {alert(data);});
    }

    function hitAction7() {
        $.ajax({
                method:'POST',
                url: "${pageContext.request.contextPath}/myMvc/action7",
        }).done(function(data) {alert(data);});
    }

    function hitAction8() {
        $.ajax({
                method:'POST',
                url: "${pageContext.request.contextPath}/myMvc/action8",
        }).done(function(data) {alert(data);});
    }

    function hitAction9() {
        $.ajax({
                method:'GET',
                url: "${pageContext.request.contextPath}/myMvc/action9",
            }).done(function(data) {alert(data);});
    }

    function hitAction10() {
        $.ajax({
                method:'GET',
                url: "${pageContext.request.contextPath}/myMvc/action10",
            }).done(function(data) {alert(data);});
    }
</script>

我所知道的是：

在重定向中：创建一个新的请求对象。

在转发中：相同的请求对象转发到下一个操作。

如果我失踪，请分享一些有关此事的规则或信息。

Answer 1

重定向会向客户端发送带有Location标头的HTTP 302响应，因此客户端无论如何都会执行GET 。

如果您希望“POST POST”案例有效，请使用正向前缀。

查看this SO question for more details on forward vs. redirect。

使用GET / POST转发或重定向到@ResponseBody方法

1 个答案: