SPRING MVC3.2案例讲解---如何获取请求参数

SPRING MVC获取request参数方法：

@RequestParam   /data/param?foo=bar 等价于 request.getParameter()

 

@PathVariable  获取URL路径 // http://127.0.0.1:8010/data/path/foo 

 

@MatrixVariable 获取URL路径中协调的键值对参数

 

@RequestHeader 获取RequestHeader 中的信息

 

@RequestBody 获取request中 流信息

 

HttpEntity<String> 可以获取request中 流信息及getHeaders等信息

 

另外：编程时大都是使用表单提交request中的参数，很少设计二进制流的request提交；演示案例中使用AJAX方法来进行二进制流的提交，见JS代码；注意data属性，它是字符串而不是JSON对象，这里在HTTP传输时使用的是字符流

 

$("form.textForm").submit(function(event) {
        var form = $(this);
        var button = form.children(":first");
        $.ajax({ type: "POST", url: form.attr("action"),

data: "foo", contentType: "text/plain", dataType: "text", success: function(text) { MvcUtil.showSuccessResponse(text, button); }, error: function(xhr) { MvcUtil.showErrorResponse(xhr.responseText, button); }});
        return false;
    });

 

 

 

见代码：

@Controller
@RequestMapping("/data")
public class RequestDataController {
    // /data/param?foo=bar
    @RequestMapping(value = "param", method = RequestMethod.GET)
    public @ResponseBody
    String withParam(@RequestParam String foo) {
        return "Obtained 'foo' query parameter value '" + foo + "'";
    }

    // http://127.0.0.1:8010/data/group?param1=foo&param2=bar&param3=baz
    @RequestMapping(value = "group", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
    public @ResponseBody
    String withParamGroup(JavaBean bean) {
        return "Obtained parameter group " + bean;
    }

    @RequestMapping(value = "produces", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
    public @ResponseBody
    JavaBean byProducesJson(JavaBean bean) {
        return bean;
    }

    // http://127.0.0.1:8010/data/path/foo
    @RequestMapping(value = "path/{var}", method = RequestMethod.GET)
    public @ResponseBody
    String withPathVariable(@PathVariable String var) {
        return "Obtained 'var' path variable value '" + var + "'";
    }

    // http://127.0.0.1:8010/data/matrixvars;foo=bar/simple

    // OUTPUT :Obtained matrix variable 'foo=bar' from path segment 'matrixvars'
    @RequestMapping(value = "{path}/simple", method = RequestMethod.GET)
    public @ResponseBody
    String withMatrixVariable(@PathVariable String path,
            @MatrixVariable String foo) {
        return "Obtained matrix variable 'foo=" + foo + "' from path segment '"
                + path + "'";
    }

    //http://127.0.0.1:8010/data/matrixvars;foo=bar1/multiple;foo=bar2
    //output: Obtained matrix variable foo=bar1 from path segment 'matrixvars' and
    // variable 'foo=bar2 from path segment 'multiple'
    @RequestMapping(value = "{path1}/{path2}", method = RequestMethod.GET)
    public @ResponseBody
    String withMatrixVariablesMultiple(@PathVariable String path1,
            @MatrixVariable(value = "foo", pathVar = "path1") String foo1,
            @PathVariable String path2,
            @MatrixVariable(value = "foo", pathVar = "path2") String foo2) {

        return "Obtained matrix variable foo=" + foo1 + " from path segment '"
                + path1 + "' and variable 'foo=" + foo2
                + " from path segment '" + path2 + "'";
    }

    // http://127.0.0.1:8010/data/header
    @RequestMapping(value = "header", method = RequestMethod.GET)
    public @ResponseBody
    String withHeader(@RequestHeader String Accept) {
        return "Obtained 'Accept' header '" + Accept + "'";
    }

    @RequestMapping(value = "cookie", method = RequestMethod.GET)
    public @ResponseBody
    String withCookie(@CookieValue String openid_provider) {
        return "Obtained 'openid_provider' cookie '" + openid_provider + "'";
    }

    @RequestMapping(value = "body", method = RequestMethod.POST)
    public @ResponseBody
    String withBody(@RequestBody String body) {
        return "Posted request body '" + body + "'";
    }

    @RequestMapping(value = "entity", method = RequestMethod.POST)
    public @ResponseBody
    String withEntity(HttpEntity<String> entity) {
        return "Posted request body '" + entity.getBody() + "'; headers = "
                + entity.getHeaders();
    }

}

 

 

另外还有传统的获取方式直接在 controller方法中使用HttpServletRequest request ，HttpServletResponse response，HttpSession session ；springMVC就可以直接调用这些变量中保存的内容；

见代码：

@Controller
public class StandardArgumentsController {

    // request related

    @RequestMapping(value="/data/standard/request", method=RequestMethod.GET)
    public @ResponseBody String standardRequestArgs(HttpServletRequest request, Principal user, Locale locale) {
        StringBuilder buffer = new StringBuilder();
        buffer.append("request = ").append(request).append(", ");
        buffer.append("userPrincipal = ").append(user).append(", ");
        buffer.append("requestLocale = ").append(locale);
        return buffer.toString();
    }

    @RequestMapping(value="/data/standard/request/reader", method=RequestMethod.POST)
    public @ResponseBody String requestReader(Reader requestBodyReader) throws IOException {
        return "Read char request body = " + FileCopyUtils.copyToString(requestBodyReader);
    }

    @RequestMapping(value="/data/standard/request/is", method=RequestMethod.POST)
    public @ResponseBody String requestReader(InputStream requestBodyIs) throws IOException {
        return "Read binary request body = " + new String(FileCopyUtils.copyToByteArray(requestBodyIs));
    }

    // response related

    @RequestMapping("/data/standard/response")
    public @ResponseBody String response(HttpServletResponse response) {
        return "response = " + response;
    }

    @RequestMapping("/data/standard/response/writer")
    public void availableStandardResponseArguments(Writer responseWriter) throws IOException {
        responseWriter.write("Wrote char response using Writer");
    }

    @RequestMapping("/data/standard/response/os")
    public void availableStandardResponseArguments(OutputStream os) throws IOException {
        os.write("Wrote binary response using OutputStream".getBytes());
    }

    // HttpSession

    @RequestMapping("/data/standard/session")
    public @ResponseBody String session(HttpSession session) {
        StringBuilder buffer = new StringBuilder();
        buffer.append("session=").append(session);
        return buffer.toString();
    }
}

 

最后上传界面截图：

 

 

 

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