Question

在spring-mvc应用程序中，我收到以下错误：

HTTP Status 400 - Required String parameter 'ownerID' is not present

当我尝试加载以下网址时：

http://localhost:8080/petclinic/owners

期待

http://localhost:8080/petclinic/owners?ownerID=1 or some other valid number.

如何更改代码以便在指定ownerID时加载预期内容，还在没有指定ownerID时加载其他指定内容，或者ownerID无效时加载？我需要在jsp或控制器类中更改jstl吗？

以下是处理/ owner url模式的OwnerController.java的一部分：

@RequestMapping(value = "/owners", method = RequestMethod.GET)
public String processFindForm(@RequestParam("ownerID") String ownerId, Owner owner, BindingResult result, Map<String, Object> model) {
    Collection<Owner> results = this.clinicService.findOwnerByLastName("");
    model.put("selections", results);
    int ownrId = Integer.parseInt(ownerId);
    Owner sel_owner = this.clinicService.findOwnerById(ownrId);//jim added this
    model.put("sel_owner",sel_owner);
    return "owners/ownersList";
}

这是ownerList.jsp的代码。请注意，它不接受选择...当我尝试用来解决此问题的块时：

<body>
<div class="container">
<table>
    <tr>
        <td></td>
        <td>
            <spring:url value="/owners/new" var="owner_newUrl"></spring:url>
            <a href="${fn:escapeXml(owner_newUrl)}" class="btn btn-info" >Add New Owner</a>
        </td>
    </tr>
    <tr>
    <td width=160 valign="top">
        <datatables:table id="owners" data="${selections}" cdn="true" row="owner" theme="bootstrap2" 
                  cssClass="table table-striped" paginate="true" info="false" 
                  cssStyle="width: 150px;" align="left" >
            <datatables:column title="Name" cssStyle="width: 150px;" display="html">
                <spring:url value="/owners?ownerID={ownerId}" var="ownerUrl">
                    <spring:param name="ownerId" value="${owner.id}"/>
                </spring:url>
                <a href="${fn:escapeXml(ownerUrl)}"><c:out value="${owner.firstName} ${owner.lastName}"/></a>
            </datatables:column>
        </datatables:table>
    </td>

<c:choose>
<c:when test="${!empty sel_owner}">
    <td valign="top">
        <table class="table table-striped" style="width:600px;">
            <tr>
                <td><b><c:out value="${sel_owner.firstName} ${sel_owner.lastName}"/></b></td>
                <td></td>
            </tr>
            <tr>
                <td><c:out value="${sel_owner.address}"/></td>
                <td><c:out value="${sel_owner.city}"/></td>
            </tr>
            <tr>
                <td><c:out value="${sel_owner.telephone}"/></td>
                <td></td>
            </tr>
            <tr>
                <td colspan=2> 

                    <spring:url value="/owners/{ownerId}/edit" var="owner_editUrl">
                        <spring:param name="ownerId" value="${sel_owner.id}"/>
                    </spring:url>
                    <a href="${fn:escapeXml(owner_editUrl)}" class="btn btn-info" >Edit This Owner</a>

                    <spring:url value="/owners/{ownerId}/pets/new" var="owner_newpetUrl">
                        <spring:param name="ownerId" value="${sel_owner.id}"/>
                    </spring:url>
                    <a href="${fn:escapeXml(owner_newpetUrl)}" class="btn btn-info" >Add New Pet</a>

                    <spring:url value="/owners?ownerID={ownerId}&type=cats" var="owner_catsUrl">
                        <spring:param name="ownerId" value="${sel_owner.id}"/>
                    </spring:url>
                    <a href="${fn:escapeXml(owner_catsUrl)}" class="btn btn-info" >Show Cats</a>

                    <spring:url value="/owners?ownerID={ownerId}&type=dogs" var="owner_dogsUrl">
                        <spring:param name="ownerId" value="${sel_owner.id}"/>
                    </spring:url>
                    <a href="${fn:escapeXml(owner_dogsUrl)}" class="btn btn-info" >Show Dogs</a>

                    <spring:url value="/owners?ownerID={ownerId}&type=all" var="owner_allUrl">
                        <spring:param name="ownerId" value="${sel_owner.id}"/>
                    </spring:url>
                    <a href="${fn:escapeXml(owner_allUrl)}" class="btn btn-info" >Show All Pets</a>
                 </td>
            </tr>
        <c:if test="${fn:endsWith(requestScope['javax.servlet.forward.query_string'], 'all')}">
            <tr>
            <td colspan=2>
                <p>Pets</p>
                    <datatables:table id="pets" data="${sel_owner.pets}" cdn="true" row="pet" theme="bootstrap2" 
                              cssClass="table table-striped" paginate="false" info="false"  filter="false"
                              cssStyle="width: 350px;" align="left" >
                        <datatables:column title="Name" cssStyle="width: 200px;" display="html">
                            <c:out value="${pet.name}"/>
                        </datatables:column>
                        <datatables:column title="BirthDate" cssStyle="width: 300px;" display="html">
                            <joda:format value="${pet.birthDate}" pattern="yyyy-MM-dd"/>
                        </datatables:column>
                        <datatables:column title="Type" cssStyle="width: 200px;" display="html">
                            <c:out value="${pet.type.name}"/>
                        </datatables:column>
                    </datatables:table>
            </td>
            </tr>
        </c:if>
        <c:if test="${fn:endsWith(requestScope['javax.servlet.forward.query_string'], 'cats')}">
            <tr>
                <td colspan=2>
                    <p>Cats</p>
                    <datatables:table id="cats" data="${sel_owner.cats}" cdn="true" row="cat" theme="bootstrap2" 
                              cssClass="table table-striped" paginate="false" info="false"  filter="false"
                              cssStyle="width: 350px;" align="left" >
                        <datatables:column title="Name" cssStyle="width: 200px;" display="html">
                            <c:out value="${cat.name}"/>
                        </datatables:column>
                        <datatables:column title="BirthDate" cssStyle="width: 300px;" display="html">
                            <joda:format value="${cat.birthDate}" pattern="yyyy-MM-dd"/>
                        </datatables:column>
                        <datatables:column title="Type" cssStyle="width: 200px;" display="html">
                            <c:out value="${cat.type.name}"/>
                        </datatables:column>
                    </datatables:table>
                </td>
            </tr>
        </c:if>
        <c:if test="${fn:endsWith(requestScope['javax.servlet.forward.query_string'], 'dogs')}">
            <tr>
                <td colspan=2>            
                <p>Dogs</p>
                    <datatables:table id="dogs" data="${sel_owner.dogs}" cdn="true" row="dog" theme="bootstrap2" 
                              cssClass="table table-striped" paginate="false" info="false"  filter="false"
                              cssStyle="width: 350px;" align="left" >
                        <datatables:column title="Name" cssStyle="width: 200px;" display="html">
                            <c:out value="${dog.name}"/>
                        </datatables:column>
                        <datatables:column title="BirthDate" cssStyle="width: 300px;" display="html">
                            <joda:format value="${dog.birthDate}" pattern="yyyy-MM-dd"/>
                        </datatables:column>
                        <datatables:column title="Type" cssStyle="width: 200px;" display="html">
                            <c:out value="${dog.type.name}"/>
                        </datatables:column>
                    </datatables:table>
                </td>
            </tr>
        </c:if>
        </table>        
    </td>
    </tr>

</c:when>
<c:otherwise>
    Print this content if there is no ownerID.
</c:otherwise>

编辑：

根据Sotirios和Loc的建议，我将我的代码更改为以下内容，但它仍然会抛出相同的错误。有人可以明确告诉我如何解决这个问题，以便/所有者网址模式可以提供“一些文本”以及所有者列表，而不是抛出错误或提供默认所有者的详细信息？

以下是OwnerController.java中的相关方法：

public String processFindForm(@RequestParam(value="ownerID", required=false) String ownerId, Owner owner, BindingResult result, Map<String, Object> model) {
    Collection<Owner> results = this.clinicService.findOwnerByLastName("");
    model.put("selections", results);
    boolean ownerIDValid;
    if(ownerId==null){ownerIDValid = false;}
    else{//I added this if test
        ownerIDValid=true;
        Integer ownrId = null;
        try {
             ownrId = Integer.parseInt(ownerId);
             Owner sel_owner = this.clinicService.findOwnerById(ownrId);//jim added this
             if (sel_owner == null) ownerIDValid = false;
             model.put("sel_owner",sel_owner);
        catch( Exception ex) {
             ownerIDValid = false;              
        }
    }
    model.put("ownerIDValid", ownerIDValid);
    return "owners/ownersList";
}

这是ownerList.jsp：

<html><head>tags and stuff</head>
<body>
<div class="container">
    <table>
        <tr>
            <td></td>
            <td>
                <spring:url value="/owners/new" var="owner_newUrl"></spring:url>
                <a href="${fn:escapeXml(owner_newUrl)}" class="btn btn-info" >Add New Owner</a>
            </td>
        </tr>
        <tr>
        <td width=160 valign="top">
            <datatables:table id="owners" data="${selections}" cdn="true" row="owner" theme="bootstrap2" 
                      cssClass="table table-striped" paginate="true" info="false" 
                      cssStyle="width: 150px;" align="left" >
                <datatables:column title="Name" cssStyle="width: 150px;" display="html">
                    <spring:url value="/owners?ownerID={ownerId}" var="ownerUrl">
                        <spring:param name="ownerId" value="${owner.id}"/>
                    </spring:url>
                    <a href="${fn:escapeXml(ownerUrl)}"><c:out value="${owner.firstName} ${owner.lastName}"/></a>
                </datatables:column>
            </datatables:table>
        </td>

<c:if test="${ownerIDValid}">
        <td valign="top">
            <table class="table table-striped" style="width:600px;">
                <tr>
                    <td><b><c:out value="${sel_owner.firstName} ${sel_owner.lastName}"/></b></td>
                    <td></td>
                </tr>
                <tr>
                    <td><c:out value="${sel_owner.address}"/></td>
                    <td><c:out value="${sel_owner.city}"/></td>
                </tr>
                <tr>
                    <td><c:out value="${sel_owner.telephone}"/></td>
                    <td></td>
                </tr>
                <tr>
                    <td colspan=2> 

                        <spring:url value="/owners/{ownerId}/edit" var="owner_editUrl">
                            <spring:param name="ownerId" value="${sel_owner.id}"/>
                        </spring:url>
                        <a href="${fn:escapeXml(owner_editUrl)}" class="btn btn-info" >Edit This Owner</a>

                        <spring:url value="/owners/{ownerId}/pets/new" var="owner_newpetUrl">
                            <spring:param name="ownerId" value="${sel_owner.id}"/>
                        </spring:url>
                        <a href="${fn:escapeXml(owner_newpetUrl)}" class="btn btn-info" >Add New Pet</a>

                        <spring:url value="/owners?ownerID={ownerId}&type=cats" var="owner_catsUrl">
                            <spring:param name="ownerId" value="${sel_owner.id}"/>
                        </spring:url>
                        <a href="${fn:escapeXml(owner_catsUrl)}" class="btn btn-info" >Show Cats</a>

                        <spring:url value="/owners?ownerID={ownerId}&type=dogs" var="owner_dogsUrl">
                            <spring:param name="ownerId" value="${sel_owner.id}"/>
                        </spring:url>
                        <a href="${fn:escapeXml(owner_dogsUrl)}" class="btn btn-info" >Show Dogs</a>

                        <spring:url value="/owners?ownerID={ownerId}&type=all" var="owner_allUrl">
                            <spring:param name="ownerId" value="${sel_owner.id}"/>
                        </spring:url>
                        <a href="${fn:escapeXml(owner_allUrl)}" class="btn btn-info" >Show All Pets</a>
                     </td>
                </tr>
            <c:if test="${fn:endsWith(requestScope['javax.servlet.forward.query_string'], 'all')}">
                <tr>
                <td colspan=2>
                    <p>Pets</p>
                            <datatables:table id="pets" data="${sel_owner.pets}" cdn="true" row="pet" theme="bootstrap2" 
                                  cssClass="table table-striped" paginate="false" info="false"  filter="false"
                                  cssStyle="width: 350px;" align="left" >
                            <datatables:column title="Name" cssStyle="width: 200px;" display="html">
                                <c:out value="${pet.name}"/>
                            </datatables:column>
                            <datatables:column title="BirthDate" cssStyle="width: 300px;" display="html">
                                <joda:format value="${pet.birthDate}" pattern="yyyy-MM-dd"/>
                            </datatables:column>
                            <datatables:column title="Type" cssStyle="width: 200px;" display="html">
                                <c:out value="${pet.type.name}"/>
                            </datatables:column>
                        </datatables:table>
                </td>
                </tr>
            </c:if>
            <c:if test="${fn:endsWith(requestScope['javax.servlet.forward.query_string'], 'cats')}">
                <tr>
                    <td colspan=2>
                        <p>Cats</p>
                        <datatables:table id="cats" data="${sel_owner.cats}" cdn="true" row="cat" theme="bootstrap2" 
                                  cssClass="table table-striped" paginate="false" info="false"  filter="false"
                                  cssStyle="width: 350px;" align="left" >
                            <datatables:column title="Name" cssStyle="width: 200px;" display="html">
                                <c:out value="${cat.name}"/>
                            </datatables:column>
                            <datatables:column title="BirthDate" cssStyle="width: 300px;" display="html">
                                <joda:format value="${cat.birthDate}" pattern="yyyy-MM-dd"/>
                            </datatables:column>
                            <datatables:column title="Type" cssStyle="width: 200px;" display="html">
                                <c:out value="${cat.type.name}"/>
                            </datatables:column>
                        </datatables:table>
                    </td>
                </tr>
            </c:if>
            <c:if test="${fn:endsWith(requestScope['javax.servlet.forward.query_string'], 'dogs')}">
                <tr>
                    <td colspan=2>            
                    <p>Dogs</p>
                        <datatables:table id="dogs" data="${sel_owner.dogs}" cdn="true" row="dog" theme="bootstrap2" 
                                  cssClass="table table-striped" paginate="false" info="false"  filter="false"
                                  cssStyle="width: 350px;" align="left" >
                            <datatables:column title="Name" cssStyle="width: 200px;" display="html">
                                <c:out value="${dog.name}"/>
                            </datatables:column>
                            <datatables:column title="BirthDate" cssStyle="width: 300px;" display="html">
                                <joda:format value="${dog.birthDate}" pattern="yyyy-MM-dd"/>
                            </datatables:column>
                            <datatables:column title="Type" cssStyle="width: 200px;" display="html">
                                <c:out value="${dog.type.name}"/>
                            </datatables:column>
                        </datatables:table>
                    </td>
                </tr>
            </c:if>
            </table>        
        </td>
        </tr>

</c:if>
<c:if test="${!ownerIDValid}">
        Print this content if there is no ownerID.
</c:if>
    </table>
</div>
</body>
</html>

Answer 1

WRITE 2方法。每种方法都有不同的映射。

@RequestMapping(value = "/owners", method = RequestMethod.GET)
public String processFindForm(Owner owner, BindingResult result, Map<String, Object> model)
{

    String ownerId = DEFAULT value;
}

@RequestMapping(value = "/owners/{ownerID}", method = RequestMethod.GET)
public String processFindForm(@RequestParam("ownerID") String ownerId, Owner owner, BindingResult result, Map<String, Object> model)
{

}

第一个服务：'/ petclinic / owners'
第二个服务'/ petclinic / owners / 100'; // 100是ownerID

OR 1这样的方法：

@RequestMapping(value = { "/owners", "/owners/{ownerID}" }, method = RequestMethod.GET)
public String processFindForm(@RequestParam(value="ownerID", required=false) String ownerId, Owner owner, BindingResult result, Map<String, Object> model)
{

}

jstl处理丢失url参数的情况

编辑：

1 个答案: