如何使用spring mvc加密和解密对象的id

Question

我有一个问题如下 - 有一个 jsp 页面 Register.jsp，它的形式如下 -

<form:form modelAttribute="user" action="Register" class="form-horizontal col-lg-8 col-lg-offset-2 col-md-10 col-md-offset-1 col-sm-12 col-xs-12" method="POST" role="form" autocomplete="off">
                    <fieldset>
                        <legend>Basic Info</legend>
                        <div class="form-group">
                            <form:label path="firstName" class="control-label col-lg-4 col-md-4 col-sm-4 col-xs-4">First Name <b>*</b></form:label>
                                <div class="col-lg-8 col-md-8 col-sm-8 col-xs-8">
                                <form:input path="firstName" type="text" name="firstName" id="firstName" class="capitalize form-control required" required="true" />
                                <form:errors path="firstName" cssClass="error" element="label"></form:errors>
                            </div>
                        </div>
                        <div class="form-group">
                            <form:label path="secondName" class="control-label col-lg-4 col-md-4 col-sm-4 col-xs-4">Middle Name</form:label>
                                <div class="col-lg-8 col-md-8 col-sm-8 col-xs-8">
                                <form:input path="secondName" type="text" name="secondName" id="secondName" class="capitalize form-control" />
                                <form:errors path="secondName" cssClass="error" element="label"></form:errors>
                            </div>
                        </div>
                        <div class="form-group">
                            <form:label path="lastName" class="control-label col-lg-4 col-md-4 col-sm-4 col-xs-4">Last Name <b>*</b></form:label>
                                <div class="col-lg-8 col-md-8 col-sm-8 col-xs-8">
                                <form:input type="text" name="lastName" path="lastName" id="lastName" class="capitalize form-control" required="true" />
                                <form:errors path="lastName" cssClass="error" element="label"></form:errors>
                            </div>
                        </div>
                        <div class="form-group">
                            <form:label path="email" class="control-label col-lg-4 col-md-4 col-sm-4 col-xs-4">Email <b>*</b></form:label>
                                <div class="col-lg-8 col-md-8 col-sm-8 col-xs-8">
                                <form:input type="email" path="email" name="email" class="form-control" required="true" />
                                <form:errors path="email" cssClass="error" element="label"></form:errors>
                            </div>
                        </div>
                        <div class="form-group">
                            <form:label path="dob" class="control-label col-lg-4 col-md-4 col-sm-4 col-xs-4">DOB <b>*</b></form:label>
                                <div class="col-lg-8 col-md-8 col-sm-8 col-xs-8">
                                <form:input path="dob" type="date" name="dob" class="dob form-control" required="true" />
                                <form:errors path="dob" cssClass="error" element="label"></form:errors>
                            </div>
                        </div>
                                <c:set var="converter" value="${converter}"></c:set>
                        <div class="form-group">
                            <form:label path="city.state.country.id" class="control-label col-lg-4 col-md-4 col-sm-4 col-xs-4">Country <b>*</b></form:label>
                                <div class="col-lg-8 col-md-8 col-sm-8 col-xs-8">
                                <form:select path="city.state.country.id" name="country" class="form-control" required="true">
                                    <c:forEach items="${countries}" var="country">
                                        <option value="${converter.encryptAnID(country.id)}"><c:out value="${country.name}"></c:out></option>
                                    </c:forEach>
                                </form:select>
                                        <form:errors path="city.state.country.id" cssClass="error" element="label"></form:errors>
                            </div>
                        </div>
                        <div class="form-group">
                            <form:label path="city.state" class="control-label col-lg-4 col-md-4 col-sm-4 col-xs-4">State <b>*</b></form:label>
                                <div class="col-lg-8 col-md-8 col-sm-8 col-xs-8">
                                <form:select path="city.state.id" name="city" class="form-control" required="true">
                                    <c:forEach items="${states}" var="state">
                                        <form:option value="${converter.encryptAnID(state.id)}"><c:out value="${state.name}"></c:out></form:option>
                                    </c:forEach>
                                </form:select>
                                    <form:errors path="city.state.id" cssClass="error" element="label"></form:errors>
                            </div>
                        </div>
                        <div class="form-group">
                            <form:label path="city.name" class="control-label col-lg-4 col-md-4 col-sm-4 col-xs-4">City <b>*</b></form:label>
                            <div class="col-lg-8 col-md-8 col-sm-8 col-xs-8">
                            <form:input path="city.name" type="text" name="city" id="city" class="capitalize form-control" required="true"/>
                            <form:errors path="city.name" cssClass="error" element="label"></form:errors>
                            </div>
                        </div>
                        <div class="form-group">
                            <form:label path="zip" class="control-label col-lg-4 col-md-4 col-sm-4 col-xs-4">Pincode/ZIP <b>*</b></form:label>
                            <div class="col-lg-8 col-md-8 col-sm-8 col-xs-8">
                            <form:input path="zip" type="text" name="zip" id="zip" class="form-control" required="true"/>
                            <form:errors path="zip" cssClass="error" element="label"></form:errors>
                            </div>
                        </div>
                        <div class="form-group">
                            <label class="control-label col-lg-4 col-md-4 col-sm-4 col-xs-4">Solve equation </label>
                            <div class="col-lg-8 col-md-8 col-sm-8 col-xs-8">
                                <img src="<c:url value='/Captcha'></c:url>">
                            </div>
                        </div>
                            <div class="form-group">
                                <label class="control-label col-lg-4 col-md-4 col-sm-4 col-xs-4" for="captcha">Solution <b>*</b></label>
                                <div class="col-lg-8 col-md-8 col-sm-8 col-xs-8">
                                    <input name="captcha" id="captcha" class="form-control" type="text" value="" required="true"/>
                                </div>
                            </div>
                        <div class="form-group">
                            <div class="col-lg-8 col-md-8 col-sm-8 col-xs-8 col-lg-offset-4 col-md-offset-4 col-sm-offset-4 col-xs-offset-4">
                                <button type="submit" class="btn btn-primary">Register</button>
                                <button type="reset" class="btn btn-default">Reset</button>
                            </div>
                        </div>
                    </fieldset>
                </form:form>

如您所见，我正在 jsp 加密国家和州的 id 现在处理这个请求的控制器方法是这样的 -

@RequestMapping(value="/Register",method= RequestMethod.POST)
    public String register(@ModelAttribute("user") @Valid User user, BindingResult bindingResult){
        if(bindingResult.hasErrors()){
            System.out.println("Errors detected");
            List<ObjectError> errors = bindingResult.getAllErrors();
            for(ObjectError error:errors){
                System.out.println(error.toString());
            }
            return "Register";
        }else{
            return "redirect:/Home";
        }
    }

用户 bean 有一个名为 country 的属性，它引用对象 Country 类 这是我的国家级 -

    @Entity
@Table(name="country"
    ,catalog="tutor"
)
public class Country  implements java.io.Serializable {


     private Integer id;
     private String name;
     private String code;
     private List<State> states = new ArrayList<State>(0);

    public Country() {
    }


    public Country(String name, String code) {
        this.name = name;
        this.code = code;
    }
    public Country(String name, String code, List<State> states) {
       this.name = name;
       this.code = code;
       this.states = states;
    }

     @Id @GeneratedValue(strategy=IDENTITY)

    @Column(name="id", unique=true, nullable=false)
    public Integer getId() {
        return this.id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    @Column(name="name", nullable=false, length=45)
    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Column(name="code", nullable=false, length=2)
    public String getCode() {
        return this.code;
    }

    public void setCode(String code) {
        this.code = code;
    }
@OneToMany(cascade=CascadeType.ALL, fetch=FetchType.LAZY, mappedBy="country")
    public List<State> getStates() {
        return this.states;
    }

    public void setStates(List<State> states) {
        this.states = states;
    }
}

提交表单后我收到此错误 -

无法将 java.lang.String 类型的属性值转换为属性 city.state.country.id 所需的 java.lang.Integer 类型；嵌套异常是 java.lang.NumberFormatException：对于输入字符串：“204169936916065690991063869295677385346323054608”

问题是国家的 id 是整数，但加密后选项的值是字符串，无法将其转换为整数。那么有什么方法可以指示控制器或 bean 使用定义的方法解密此值，该方法将采用字符串参数并在验证之前返回整数。

Answer 1

使用 Spring 的 Formatter 和/或转换器，而不是自己滚动。这将被调用来渲染和解析结果。