小编fai*_*izi的帖子

我有一个具有以下结构的mongodb集合term

{
    "_id" : "00002c34-a4ca-42ee-b242-e9bab8e3a01f",
    "terminologyClass" : "USER",
    "code" : "X67",
    "terminology" : "some term related notes",
    "notes" : "some notes"
}

和一个表示术语集合的java类 Term.java

@Document
public class Term{  

    @Id
    protected String termId;

    @Indexed
    protected String terminologyClass;

    @Indexed(unique=true)
    protected String code;

    @Indexed
    protected String terminology;

    protected String notes;

    //getters & setters
}

我term收藏了很多文件.现在我添加了一个新字段Term.javaas

@Indexed
protected String status;

添加字段status后Term.java,在向term集合中插入新术语时,我得到了一个例外:

com.mongodb.MongoException:带名称的索引:代码已经存在,具有不同的选项

我使用的是MongoDB版本:2.6.5和spring-data-mongodb版本:1.3.2

我正在使用带@JmsListener注释的方法监听JMS消息,如下所示.

@JmsListener(destination="exampleQueue")  
public void fetch(@Payload String message){  
    process(message);  
}

当这个方法执行导致异常时,我得到了一个警告日志

Execution of JMS message listener failed, and no ErrorHandler has been set.

如何设置ErrorHandler处理案例.我正在使用spring boot 1.3.3.RELEASE

我有一个records这样的收藏

{
    "recordId" : "5a65d212-774e-4208-8cb4-bf4e92e80898",
    "recordName" : "recordABC",
    "entries" : [
        {
            "formId" : "f548684e-31a7-4e63-af5c-4120670f963f",
            "formSequence" : 1,
            "fieldId" : "element1",
        },
        {
            "formId" : "f548684e-31a7-4e63-af5c-4120670f963f",
            "formSequence" : 2,
            "fieldId" : "element2",
            "value" : "notes"
        },
        {
            "formId" : "f548684e-31a7-4e63-af5c-4120670f963f",
            "formSequence" : 1,
            "fieldId" : "element3",
            "value" : [
                {
                    "originalFileName" : "fileA",
                    "thumbnail" : "thumbnailA"
                },
                {
                    "originalFileName" : "fileB",
                    "thumbnail" : "thumbnailB"
                },
                {
                    "originalFileName" : "fileC",
                    "thumbnail" : "thumbnailC"
                },
                {
                    "originalFileName" : "fileD",
                    "thumbnail" …

使用jsp我们可以将html元素渲染为

<c:set var="size" value="0" />
<c:forEach items="${fields}" var="field" varStatus="status">

    <c:if="${status.first}">
        <div class="row">
    </c:if>

    <c:set var="size" value="${size + field.size}" />
    <c:if="${size > 12}">
        </div>
        <div class="row">
        <c:set var="size" value="${field.size}" />
    </c:if>

    <jsp:include page="/WEB-INF/jsp/field.jsp" >
        <jsp:param name="field" value="${field}"/>
    </jsp:include>  

    <c:if="${status.last}">
        </div>
    </c:if>

</c:forEach>

这里我<div class="row"></div>根据字段的大小构建htmls输入元素(大小6变为span6).如果我的字段列表有4个元素,大小为6,3,8和4,它将把html渲染为

<div class="row">
  <div class="span6">
     <input />
  <div>
  <div class="span3">
     <input />
   <div>
</div>
<div class="row">
  <div class="span8">
     <input />
  <div>
  <div class="span4">
     <input />
   <div>
</div>

我试图将前几节转换为百日咳作为

<th:block th:with="size=0">
    <th:block th:each="field, iterStat : ${fields}">
        <th:block …

我的html页面内容为

<div class="span12">
    <img id="myImg" src="myImage.png" style="max-width: 100%; height: auto;" />
</div>

其中 的实际大小myImage.png是1600 * 900。图像按尺寸渲染796 * 448（拉伸并保持纵横比）。

我正在尝试将img元素（大小为 796 * 448）转换为canvas使用javascriptas 的元素

function convertImgToCanvas(){
    var myImgElement = document.getElementById("myImg");
    var myCanvasElement = document.createElement("canvas");
    myCanvasElement.width = myImgElement.width;
    myCanvasElement.height = myImgElement.height;
    var context = myCanvasElement.getContext('2d');
    context.drawImage(myImgElement,0,0);    
}

生成的画布有尺寸1600 * 900，而不是796 * 448。我期望画布的大小为796 * 448.

如果我将画布的高度和宽度设置为

myCanvasElement.width = '796px';
myCanvasElement.height = '448px';

画布的大小变为 …

我有两个LoginViewController控制器UserViewController

@Controller
public class LoginViewController {

    @Autowired
    private UserViewController userViewController;  //Can't autowire, since spring creates a proxy for UserViewController class

    @RequestMapping(value="/login", method=POST)
    public String login(){

        //username and password checking etc

        if(login_successfull){
            //When login successfull, i need to redirect the screen to user dashboard  
            model.addAttribute("loginMessage", "You are loggined successfully")
            return userViewController.viewDashboard(userId);
        }   
    }
}

@Controller
@RequestMapping("/user")
public class UserViewController {

    @Autowired 
    private UserService userService;

    @RequestMapping(value="/dashboard", method=GET)
    public String viewDashboard(Model model, @RequestParam(value="id", required=true) Long userId){
        //Fetch and send user …