将数组从Jquery发送到Struts1方法

我的jsp和jquery代码为

var article = new Object(); article.title = "abc"; article.url = "abc"; article.categories = [1,2,3]; article.tags = [1,2,3]; console.log('hi'); $.ajax({ type: 'POST', url: URL, contentType:"application/json", data: JSON.stringify(article), dataType: 'json', success: function(result) { console.log(result); }, error: function(e){ alert('Error in Processing'); } }); 

和我的java代码一样

  BufferedReader br = new BufferedReader(new InputStreamReader(request.getInputStream())); String json = ""; if(br != null){ json = br.readLine(); } // 2. initiate jackson mapper ObjectMapper mapper = new ObjectMapper(); //mapper.configure(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true); // 3. Convert received JSON to Article Article article = mapper.readValue(json, Article.class); 

现在我的Arcticle课程是

 public class Article { private String title; private String url; private List categories; private List tags; //getters and setters } 

现在我正在排除exception

 String json = ""; if(br != null){ json = br.readLine(); } 

我得到如下json

 {"title":"abc","url":"abc","categories":"[1, 2, 3]","tags":"[1, 2, 3]"} 

实际上它应该是

 {"title":"abc","url":"abc","categories":[1, 2, 3],"tags":[1, 2, 3]} 

我不明白发生了什么，因此我得到exception，因为com.fasterxml.jackson.databind.JsonMappingException：无法在[来源：java.io.StringReader@f94ca;来自VALUE_STRING标记的反序列化java.util.ArrayList的实例。 line：1，column：27]（通过参考链：com.ihexa.common.admin.cabsharing.action.Article [“categories”]）

我按照以下方式解决了答案

文章user = mapper.readValue（point，Article.class）;

的System.out.println（user.getRouteFirst（））;

Gson gson = new Gson（）;

TypeToken> token = new TypeToken>（）{}; 列出personList = gson.fromJson（user.getRouteFirst（），token.getType（））;

文章类为

公共类别文章{

 private String routeFirst; private String routeSecond; 

//塞特犬和吸气剂

}

jsp jquery代码为

 var article = new Object(); article.routeFirst = newRoute1; article.routeSecond = newRoute2; $.ajax({ type: 'POST', url: '../..//admin/cabsharing/findIntersesctionPoint.do', data : "point="+JSON.stringify(article), dataType: 'json', success: function(result) { console.log("success"); }, error: function(e){ console.log("error"); } }); 

Answer 1

我的jsp会，

          send jdon Data   

我的servlet将是，

 public class JsonServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String point = request.getParameter("point"); System.out.println("Point : " + point ); if(point != null){ ObjectMapper mapper = new ObjectMapper(); try { // read from string, convert it to Article class object Article user = mapper.readValue(point, Article.class); // Conver the Article class object in to the JSON string System.out.println("Output Json String is :::::::::::> "+mapper.writeValueAsString(user)); } catch (Exception e) { e.printStackTrace(); } } } } 

这是我在控制台中得到的output ，

 Point : {"title":"abc","url":"abc","categories":[1,2,3],"tags":[1,2,3]} Json String is :::::::::::> {"title":"abc","url":"abc","categories":["1","2","3"],"tags":["1","2","3"]} 

希望这可以帮助。