如何在Java中单击链接调用方法？答案

【问题标题】：How to call the method in Java clicking on a link?如何在Java中单击链接调用方法？
【发布时间】：2019-01-10 04:55:58
【问题描述】：

这是我的 servlet：

   @WebServlet({ "/Response", "/reportsto" })
  public class Response extends HttpServlet {
  private static final long serialVersionUID = 1L;

/**
 * @see HttpServlet#HttpServlet()
 */
public Response() {
    super();
    // TODO Auto-generated constructor stub
}

/**
 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 */
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    services2   messageservice = new services2();
    services3      jiraservice = new services3();
    service4            empid = new service4();
    String id = request.getParameter("ManagerId");

    try {

        String name="";
        String id1 =empid.getEmpId(id);
        System.out.println("id is ===> "+id1);
        Map<Object, Object> map=messageservice.getReportees(id1);
        Set<Map.Entry<Object,Object>> s1=map.entrySet();
        for (Iterator<Map.Entry<Object,Object>> iterator = s1.iterator(); iterator.hasNext();)  {
            Map.Entry<Object,Object> entry = iterator.next();
            Object name1 = entry.getKey();
            Object value = entry.getValue();
                    PrintWriter out=response.getWriter();
                    out.println("<html><body><table>\r\n" + 
                            "<tr>\r\n" + 
                            "<th>User Id</th>\r\n" + 
                            "<th>Username</th>\r\n" + 
                            "</tr>\r\n" + 
                            "<tr>\r\n" + 
                            "<td>"+value+"</td>\r\n" + 
                            "<td><a href=''>"+name1+"</a></td>\r\n" + 
                            "</tr>\r\n" + 
                            "</table></body></html>");
 //how should I pass the object value to getJiras which   accepts the strings.   
                }
    I will get the output as:
      User Id   Username
      AR12345   Anagha R

因此，如果我单击 Anagha，则必须将用户 ID 传递给返回类型为 Map Object 的 getJiras，然后它应该处理并显示 CHA-3603：在上述输出的同一页面中验证浏览器上的发布。

 getJiras()

   public class services3{ 
   public Map<Object, Object> getJiras(String values) throws Exception {
        String api = "https:*****";
        String id  = values;
        String ext= "******";
        String url = api+id+ext;
        String name = "******";
        String password = "********";
        String authString = name + ":" + password;
        String authStringEnc = new BASE64Encoder().encode(authString.getBytes());
        System.out.println("Base64 encoded auth string: " + authStringEnc);
        Client restClient = Client.create();
        WebResource webResource = restClient.resource(url);
        ClientResponse resp = webResource.accept("application/json")
                                         .header("Authorization", "Basic " + authStringEnc)
                                         .get(ClientResponse.class);
        if(resp.getStatus() != 200){
            System.err.println("Unable to connect to the server");
        }
      //here I am trying to parse the json data.
        JSONParser parse = new JSONParser();
        JSONObject jobj = (JSONObject)parse.parse(output);
        JSONArray jsonarr_1 = (JSONArray) jobj.get("issues");
        System.out.println("The total number of issues in validating release   are:"+jsonarr_1.size());

        Map<Object, Object> map=new HashMap<Object,Object>();
        for(int i=0;i<jsonarr_1.size();i++){
            JSONObject jsonobj_1 = (JSONObject)jsonarr_1.get(i);
            JSONObject jsonobj_2 = (JSONObject)jsonobj_1.get("fields");
            JSONObject status1   = (JSONObject)jsonobj_2.get("status");
            JSONObject issuetype = (JSONObject)jsonobj_2.get("issuetype");

            Object obj1         =  jsonobj_1.get("key");
            Object obj2         =  status1.get("name");

            map.put(obj1, obj2);
        }
        return  map;
    }

另外我怎样才能在浏览器中显示正在打印的json数组大小。问题越来越复杂，请帮助解决这个问题。提前谢谢

【问题讨论】：

我建议看看Spring MVC架构和Spring Boot。像你一样编写核心 servlet 是可能的，但要困难得多。

标签： java

【解决方案1】：

您可以创建另一个 servlet 或使用相同的 servlet 再发出一个 get 请求。该请求将调用jira service。

案例 1：创建另一个 servlet，它与您正在做的类似案例 2：您可以自定义当前的 servlet 方法doGet。示例代码如下。

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  String requestAction = request.get("action");
  if("detail".equals(requestAction)) {
    services3 service = new services3();
     //get result.
  } else if("view".equals(requestAction)){
   //your current code
  }
  //add result to response
}

【讨论】：

嘿，如果我们创建另一个 servlet，我们如何将 value 参数传递给另一个调用 jira 服务的 servlet
@RAMYA，可以使用web.xml配置多个servlet。看看这个stackoverflow.com/questions/43559372/…
假设我现在有另一个名为 servlet2 的 servlet，我应该如何在 href 标记中从 servlet1 传递值参数（动态变化）