java - 无法从 Jersey 响应中获取正确的 json 值

Question

我正在从数据库中获取值，并且我有一个 Web 服务，它返回从数据库中获取的值列表，我将它发送到前端 View 层，就像 Web 服务调用一样，应角度的要求

问题是我得到的 json 值不正确。它获取键而不是值。当我在 chrome 控制台中看到它时，json 就像:

{"jobName":"NASA Scientist",
"jobPrimarySkill":null,
"jobRole":"JOB_ROLE",
"jobDesignation":"JOB_EXP",         // keyname instead of value (Incorrect values)
"jobDescription":"JOB_DESCRIPTION", // keyname instead of value (Incorrect values)
"jobSalaryRange":"JOB_POSITIONS",   // keyname instead of value (Incorrect values)
"jobExp":"JOB_SAL_RANGE",           // keyname instead of value (Incorrect values)
"jobPositions":"JOB_POSTEDBY",      // keyname instead of value (Incorrect values)
"jobPostedBy":null}

我的后端代码是这样的:

@Path("/FetchJobSummary")
public class FetchJobSummaryService {

FetchJobSummaryDAO dao = new FetchJobSummaryDAO();

@GET
@Produces(MediaType.APPLICATION_JSON)
public List fetch() {

    System.out.println(dao.getJobSummaries()); 
    // prints object [com.RTH.WebServices.JobSummaries@6d90d6c5, 
        com.RTH.WebServices.JobSummaries@6d90d6c5, 
        com.RTH.WebServices.JobSummaries@6d90d6c5,....

    return dao.getJobSummaries();
    }
}

DAO 类:

public class FetchJobSummaryDAO {

public List getJobSummaries() {

JobSummaries jobSummaries = new JobSummaries();
List<JobSummaries> jobSummaryList = new ArrayList<JobSummaries>();

try {
    Connection con = DBConnection.getConnection();

    String query = "select JOB_NAME,JOB_DESCRIPTION,JOB_ROLE,JOB_PRIMARY_SKILL,JOB_DESIGNATION,JOB_EXP,JOB_SAL_RANGE, JOB_POSTEDBY from TBL_JOBPOSTING";

    PreparedStatement pst = con.prepareStatement(query);
    ResultSet rs = pst.executeQuery();

    ResultSetMetaData rsmd = rs.getMetaData();
    int columnsNumber = rsmd.getColumnCount();
    while (rs.next()) {
        jobSummaries.setJobName(rs.getString("JOB_NAME"));
        jobSummaries.setJobDescription("JOB_DESCRIPTION");
        jobSummaries.setJobRole("JOB_ROLE");
        jobSummaries.setJobPrimarySkill(rs.getString("JOB_PRIMARY_SKILL"));
        jobSummaries.setJobDesignation("JOB_DESIGNATION");
        jobSummaries.setJobExp("JOB_EXP");
        jobSummaries.setJobSalaryRange("JOB_SAL_RANGE");
        jobSummaries.setJobPostedBy("JOB_POSTEDBY");
        jobSummaryList.add(jobSummaries);

        for (int i = 1; i <= columnsNumber; i++) {
            if (i > 1) {
               System.out.print(",  ");
            }
            String columnValue = rs.getString(i);
            System.out.print(rsmd.getColumnName(i) + " " + columnValue); //Prints correct values
        }
        }

} catch (SQLException ex) {
    Logger.getLogger(FetchJobSummaryDAO.class.getName()).log(Level.SEVERE, null, ex);
}
return jobSummaryList;
}

我确信它是 java 中某个地方的问题而不是前端中的问题，但没有弄清楚哪里出了问题

Answer 1

你有

jobSummaries.setJobRole("JOB_ROLE");

代替

jobSummaries.setJobRole(rs.getString("JOB_ROLE"));

所以你应该有

    jobSummaries.setJobName(rs.getString("JOB_NAME"));
    jobSummaries.setJobDescription(rs.getString("JOB_DESCRIPTION"));
    jobSummaries.setJobRole(rs.getString("JOB_ROLE"));
    jobSummaries.setJobPrimarySkill(rs.getString("JOB_PRIMARY_SKILL"));
    jobSummaries.setJobDesignation(rs.getString("JOB_DESIGNATION"));
    jobSummaries.setJobExp(rs.getString("JOB_EXP"));
    jobSummaries.setJobSalaryRange(rs.getString("JOB_SAL_RANGE"));
    jobSummaries.setJobPostedBy(rs.getString("JOB_POSTEDBY"));
    jobSummaryList.add(jobSummaries);