Question

我正在尝试以html形式传递数据集；

<form class="form-inline" id="createjobform" method="POST" th:action="@{/createJob}">
...
<div class="form-group">
    <input type="text" class="form-control" id="nopth"
    placeholder="Number Of People To Hire" name="nopth" />
</div>
<div class="form-group">
    <input type="text" readonly="readonly" class="form-control"
    id="listid" placeholder="ID" name="listid"
    title="ID of the list which associated" 
    th:value="${findOneList.id}"/>
</div>

这里的listid来自另一个表（manytoone-onetomany），我想用此listid添加新记录。当我在phpmyadmin上执行此操作时，它正在工作。但是我想使用ajax发布请求来执行此操作，或者实际上不使用ajax来执行此操作。我尝试了两种方式，但显示相同的错误。

这是我的控制人；

@RequestMapping(value = "/createJob", method = RequestMethod.POST)
public @ResponseBody void createJob(@RequestBody Jobs jobs,
        @RequestParam(value = "title", required = false) String title,
        @RequestParam(value = "description", required = false) String description,
        @RequestParam(value = "nopth", required = false) Integer nopth,
        @RequestParam(value = "lastDate", required = false) Date lastDate,
        @RequestParam(value = "listid", required = false) Long listid,
        HttpServletResponse hsr) throws IOException {

    // if I do String nopth above and then
    //jobs.setNopth(Integer.valueOf(nopth));
    // error is NumberFormatException (cannot cast string to int)

    jobs.setLastDate(lastDate);
    jobs.setTitle(title);
    jobs.setDescription(description);
    jobs.setNopth(nopth);
    Lists listttt = listsService.findOne(listid);
    jobs.setLists(listttt);

    jobsService.save(jobs);
    mavHomepage.addObject("findOneList", listsService.findOne(jobs.getId()));
    mavHomepage.addObject("mod", "VIEW_ONELIST");
    hsr.sendRedirect("/oneList?id=" + listid);
}

所以错误是

error: "Internal Server Error"
exception: "java.lang.NullPointerException"
message: "No message available"
path: "/createJob"
status: 500

jobs.setNopth（nopth）;

也是错误；

error: "Internal Server Error"
exception: "org.springframework.dao.InvalidDataAccessApiUsageException"
message: "The given id must not be null!; nested exception is 
java.lang.IllegalArgumentException: The given id must not be null!"
path: "/createJob"
status: 500

在行列表listttt = listsService.findOne（listid）;

这与ajax / post无关。当我这样做的时候

public @ResponseBody void createJob(@RequestBody Jobs jobs,
    @RequestParam(value="listid, required="false") listid,
    HttpServletResponse hsr){

        Lists listttt = listsService.findOne(listid);
        jobs.setLists(listttt);
         ...
}

和ajax;

var formData = {
    title : $("#title").val(),
    description : $("#description").val(),
    nopth : $("#nopth").val(),
    lastDate : $("#lastDate").val(),
    listid : $("#listid").val(),
}
...
$.ajax({
        type : "POST",
        contentType : "application/json",
        url : "/createJob",
        data : JSON.stringify(formData),
....

相同错误（给定的id不能为null！）

那我该如何从整数或长值形式的数据中传递数据？使用AJAX会更好。并且listid是外键。

模型类；

@Entity(name = "jobs")
public class Jobs {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;

@Column(name = "Title")
private String title;

@Column(name = "Description")
private String description;

@Column(name = "Number_Of_People_To_Hire")
private Integer nopth;

@Column(name = "Last_Application_Date")
private Date lastDate;

@ManyToOne(fetch=FetchType.LAZY)
@JoinColumn(name="listid")
private Lists lists;

...

@Entity(name = "lists")
public class Lists implements Serializable {

private static final long serialVersionUID = 1L;

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
public Long id;

@Column(name = "List_Name")
public String listname;

@OneToMany(mappedBy = "lists", cascade = CascadeType.ALL)
private List<Jobs> jobs;

我尝试将nopth的类型更改为String，Integer等，并输入type =“ text或number”不变。

Answer 1

@RequestBody此注释指示方法参数应绑定到Web请求的正文

所以您必须像这样修复控制器：

@RequestMapping(value = "/createJob", method = RequestMethod.POST)
@ResponseBody
public void createJob(
    @RequestBody Jobs jobs,
    @RequestParam("listid") Long listid
    HttpServletResponse hsr) throws IOException {

   Lists listttt = listsService.findOne(listid);
   jobs.setLists(listttt);

   jobsService.save(jobs);

   ...

}

您的jquery请求：

var formData = {
    title : $("#title").val(),
    description : $("#description").val(),
    nopth : $("#nopth").val(),
    lastDate : $("#lastDate").val()
}

var listid : $("#listid").val(),

var settings = {
  "url": "http://localhost:8080/createJob?listid="+listid,
  "method": "POST",
  "data": JSON.stringify(formData)
  "headers": {
    "Content-Type": "application/json"
  }
 }

 $.ajax(settings).done(function (response) {
   console.log(response);
 });

使用Ajax / Post传递整数数据时，Spring Controller会引发NullPointerException

1 个答案: