Struts2 Json Configuration

1, add struts2 corresponding to the struts2-json-plugin -*. jar 2. Configure your Action to inherit the json-default [// 2] 3. Return the json type [// 3] example: [java] @ ParentPackage (value = "json-default") // 2 public class IndexAction extends ActionSupport {private List <Category> list = new ArrayList <Category> (); @ Action (value = "/index", results = {@ Result (name = SUCCESS, type = "json")}) // 3 public String execute () {list = CategoryDao. getInstance (). getCategorys (); // System. out. println (list); // System. out. println (list. size (); return SUCCESS;} public List <Category> getList () {return list;} public void setList (List <Category> list) {this. list = list ;}} note: In your request, "content-type" must be "application/json" json-related