Question

我正在使用JSON数组从Servlet中获取Db中的值。我正在起诉以下代码

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    List<ProjectDto> act=new ArrayList<ProjectDto>();
    act=ActivitiesDao.getActivitiesDetails();
    JSONArray jsonarray= new JSONArray();

    for(int i=0;i<act.size();i++)
    {
        JSONObject obj = new JSONObject();
        //obj.put("issueno", quiz.get(i).getIssueno());
        obj.put("projectName",act.get(i).getProjectName());         
        obj.put("projectDescription",act.get(i).getProjectDescription());
        obj.put("currentStatus", act.get(i).getCurrentStatus());
        obj.put("area", act.get(i).getArea());          
        jsonarray.put(obj);
    }
    System.out.println("Json in Servelt"+ jsonarray.toString());        
    response.getWriter().print(jsonarray.toString());
    }

}

我能够成功从DB获得价值。我在控制台中打印了价值。

现在，我在其他一些java文件中定义了一个方法来转换段落中的数据。现在，我按照以下方式在Servlet中调用该方法：

//方法：

    public static List<String> convertParagraphs(String text){

    List <String> convertedList= new ArrayList<String>();

    if(text==null|| text==""){

    }
    else{
    String[] paragraphs= text.split("\\|");

    convertedList= Arrays.asList(paragraphs);
    }
    return convertedList;

}

在Servlet中调用此方法：

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    List<ProjectDto> act=new ArrayList<ProjectDto>();
    act=ActivitiesDao.getActivitiesDetails();
    JSONArray jsonarray= new JSONArray();



    for(int i=0;i<act.size();i++)
    {
        JSONObject obj = new JSONObject();
        obj.put("projectName",act.get(i).getProjectName());     
        String ttextt= act.get(i).getProjectDescription();
        obj.put("ProjectDescriptionList" , act.get(i).setProjectDescriptionList(NewsletterUtil.convertParagraphs(ttextt)));
        obj.put("currentStatus", act.get(i).getCurrentStatus());
        obj.put("area", act.get(i).getArea());
        obj.put("ProjectDescriptionList" , act.get(i).setProjectDescriptionList(NewsletterUtil.convertParagraphs(ttextt)));
        jsonarray.put(obj);

    }
    System.out.println("Json in Servelt"+ jsonarray.toString());

    response.getWriter().print(jsonarray.toString());
    }

}

Getters and Setters方法：

public class ProjectDto {

private String projectName;
private String projectDescription;
private String currentStatus;
private String area;
private List<String> projectDescriptionList= new ArrayList<String>();

private List<String> currentStatusList=new ArrayList<String>();


public List<String> getCurrentStatusList() {
    return currentStatusList;
}
public void setCurrentStatusList(List<String> currentStatusList) {
    this.currentStatusList = currentStatusList;
}


public List<String> getProjectDescriptionList() {
    return projectDescriptionList;
}
public boolean setProjectDescriptionList(List<String> projectDescriptionList) {
    this.projectDescriptionList = projectDescriptionList;
    return false;
}
public String getCurrentStatus() {
    return currentStatus;
}
public void setCurrentStatus(String currentStatus) {
    this.currentStatus = currentStatus;
}
public String getArea() {
    return area;
}
public void setArea(String area) {
    this.area = area;
}

public String getProjectName() {
    return projectName;
}
public void setProjectName(String projectName) {
    this.projectName = projectName;
}
public String getProjectDescription() {
    return projectDescription;
}
public void setProjectDescription(String projectDescription) {
    this.projectDescription = projectDescription;
}
@Override
public String toString() {
    return "ProjectDto [projectName=" + projectName
            + ", projectDescription=" + projectDescription
            + ", currentStatus=" + currentStatus + ", area=" + area
            + ",  projectDescriptionList="
            + projectDescriptionList + "]";
}

}

问题：现在，我正在打印ProjectDescription List的值，它返回false值。我不确定我在哪里做错了。我试图以多种方式解决问题，但无法解决问题。你可以请你纠正我并向我推荐我的问题。

请在jsp中找到我的ajax代码

    <script>
  $.ajax({
        type: "POST",
        url: "./ProjectServlet",
        success: function (responseText) {
            var jsonData = JSON.parse(responseText);
            var uniueTabs = getUniqueLists(jsonData);

      for (var i = 0; i < uniueTabs.length; i++) {
           $('#tabs').append('<li ><a href="#tab-content-' + i + '">' + uniueTabs[i].area + '</a></li>');
            var div = '<div id="tab-content-' + i + '" class="tab-pane fade">';

            for (var j = 0; j < uniueTabs[i].tabContent.length; j++) {
                var obj = uniueTabs[i].tabContent[j];
                div += '<p>' + obj.projectName + '</p>'+  '<p>' + obj.projectDescription + '</p>' + obj.currentStatus   ;
    }

    $('.tab-content').append(div);
            $('#tab-content-0').addClass('in active');
           }

            $('#tabs li').eq(0).addClass('active');
        setListner();



    function getUniqueLists(responseText) {
        var resArr = [];
        responseText.filter(function (x, i) {
            if (resArr.indexOf(x.area) === -1) {
                resArr.push(x.area);
            }
        })
        //console.log(resArr);
        return mergeDataAreaWise(resArr, responseText);
    }

    function mergeDataAreaWise(area, responseText) {
        var tabList = [];
        for (var i = 0; i < area.length; i++) {
            tabList.push({
                area: area[i],
                tabContent: []
            });
        }
        var prjlist;
        var output; 
        var proh;

        var status;


        for (var i = 0; i < tabList.length; i++) {
            for (var j = 0; j < responseText.length; j++) {            

          statuss = '<li>' + responseText[j].currentStatus + '</li>';
          prjlist= responseText[j].projectDescriptionList;


         /*  output= prjlist.split("&");
          proh=output.join("/n");
           */
          //proh=prjlist.replace(/&/g, '<br>');
          status =statuss.replace(/&/g, '<br>');

                var Obj = {

                    projectName: '<h3>'+ responseText[j].projectName +'</h3>',

                    projectDescription: '<p>'+ prjlist + '<p>',


                     currentStatus: '<b>'+ "Current Status:" +'</b>' + status 





                }


                   var currentArea = responseText[j].area;


                if (tabList[i].area === currentArea) {
                    tabList[i].tabContent.push(Obj);
                }
            }
        }


        console.log(tabList);
        return tabList;
    }



    }

    });
    function setListner () {
        $("#tabs a").click(function () {
            $(this).tab('show');
        });
    }


</script>

Answer 1

当然，您将获得false的值。

在你的setter中你返回boolean，它确实设置了projectDescriptionList的值，但最后每次都返回硬代码false。

解决方案，

在你的getter-setter中;

// optional, just stick to setter rules, set the value and don't return anything.

public setProjectDescriptionList(List<String> projectDescriptionList) {
    this.projectDescriptionList = projectDescriptionList;
}

在for循环中的doPost，问题的第三部分代码

act.get(i).setProjectDescriptionList(NewsletterUtil.convertParagraphs(ttextt));
obj.put("ProjectDescriptionList" ,act.get(i).getProjectDescriptionList() );
obj.put("currentStatus", act.get(i).getCurrentStatus());
obj.put("area", act.get(i).getArea());
// I don't know why you wrote it twice.. I'm commenting it.
//   obj.put("ProjectDescriptionList" , act.get(i).setProjectDescriptionList(NewsletterUtil.convertParagraphs(ttextt)));
jsonarray.put(obj);

我无法使用JsonArray获取Servlet中的列表值

1 个答案: