我正在使用Spring MVC，我实现了 ResultSetExtractor ，因为我的一个类有一个复杂的列表对象。我做了映射，然后从数据库中进行选择。我在显示 ResultSetExtractor 中列表项的数据时遇到问题。我希望我正确地进行了映射。其他属性有数据。问题是在jsp中显示Listvictims和Listcriminals的值。
Under是代码：
JSP
我在crimeRecNo中获取数据，但犯罪详情却不在受害者身上。
修改
我更新了代码但是我没有在受害者列表中获得任何值，在jsp上没有打印任何内容。其他元素正在获取数据。我不确定ResultSetExtractor是否已正确写入列表项。
<form:form id="crimeList" name ="crimeList">
<div id ="content">
<c:forEach items="${crimes}" var="crime">
<div id="table">
<label>${crime.crimeRecNo}</label>
<label>${crime.crimeDetails}</label>
<c:forEach items="${crime.victims}" var="victim">
<label>${victim.fName}</label>
</c:forEach>
</div>
</c:forEach>
</div>
</form:form>
ResultSetExtractor映射
如果我的映射不正确，请纠正我
private static final class CrimeMapper implements ResultSetExtractor<List<Crime>>{
public List<Crime> extractData(ResultSet rs) throws SQLException, DataAccessException {
Map<Integer, Crime> map = new HashMap<Integer, Crime>();
Crime crime = null;
while (rs.next()){
int crimeRecNo = rs.getInt("crimeRecNo");
crime = map.get(crimeRecNo);
if (crime == null){
crime = new Crime();
crime.setCrimeRecNo(crimeRecNo);
crime.setCrimeDate(rs.getString("crimeDate"));
crime.setCrimeDetails(rs.getString("crimeDetails"));
crime.setCrimeStreetLn1(rs.getString("crimeStreetLn1"));
crime.setCrimeStreetLn2(rs.getString("crimeStreetLn2"));
crime.setCrimeLatLocation(rs.getBigDecimal("crimeLatLocation"));
crime.setCrimeLongLocation(rs.getBigDecimal("crimeLongLocation"));
crime.setCrimeTime(rs.getString("crimeTime"));
crime.setInvestigatingOfficerId(rs.getString("investigatingOfficerId"));
crime.setCrimeLevelId(rs.getInt("crimeLevelId"));
crime.setOffenceCatId(rs.getInt("offenceCatId"));
crime.setOffenceTypeId(rs.getInt("offenceTypeId"));
crime.setStatusId(rs.getInt("statusId"));
crime.setRecordedById(rs.getString("recordedById"));
crime.setVictims(new ArrayList<Citizens>());
crime.setCriminals(new ArrayList<Citizens>());
map.put(crimeRecNo, crime);
}
Integer socialSecurityNumber = rs.getInt("socialSecurityNumber");
Integer citizenTypeId = rs.getInt("citizenTypeId");
if(socialSecurityNumber > 0 & citizenTypeId == 3){
Citizens victims = new Citizens();
victims.setAddLn1(rs.getString("addLn1"));
victims.setAddLn2(rs.getString("addLn2"));
victims.setAddLn3(rs.getString("addLn3"));
victims.setCitizenTypeId(rs.getInt("citizenTypeId"));
victims.setCountryId(rs.getInt("countryId"));
victims.setEthnicityId(rs.getInt("ethnicityId"));
victims.setfName(rs.getString("fName"));
victims.setGenderId(rs.getString("genderId"));
victims.setHairColorId(rs.getString("hairColorId"));
victims.setHeight(rs.getDouble("height"));
victims.setlName(rs.getString("lName"));
victims.setMaritalStatusId(rs.getInt("maritalStatusId"));
victims.setNoticeableFeatures(rs.getString("noticableFeatures"));
victims.setOccupationId(rs.getInt("occupationId"));
victims.setoName(rs.getString("oName"));
victims.setPhoneNo(rs.getString("phoneNo"));
victims.setPhoto(rs.getString("photo"));
victims.setSkinColorId(rs.getString("skinColorId"));
victims.setSocialSecurityNumber(rs.getInt("socialSecurityNumber"));
victims.setWeight(rs.getDouble("weight"));
victims.setEyeColorId(rs.getString("eyeColorId"));
victims.setDob(rs.getDate("dob"));
victims.setName(rs.getString("fName") +" "+ rs.getString("lName"));
crime.getVictims().add(victims);
} else if(socialSecurityNumber > 0 & citizenTypeId == 2){
Citizens criminal = new Citizens();
criminal.setAddLn1(rs.getString("addLn1"));
criminal.setAddLn2(rs.getString("addLn2"));
criminal.setAddLn3(rs.getString("addLn3"));
criminal.setCitizenTypeId(rs.getInt("citizenTypeId"));
criminal.setCountryId(rs.getInt("countryId"));
criminal.setEthnicityId(rs.getInt("ethnicityId"));
criminal.setfName(rs.getString("fName"));
criminal.setGenderId(rs.getString("genderId"));
criminal.setHairColorId(rs.getString("hairColorId"));
criminal.setHeight(rs.getDouble("height"));
criminal.setlName(rs.getString("lName"));
criminal.setMaritalStatusId(rs.getInt("maritalStatusId"));
criminal.setNoticeableFeatures(rs.getString("noticableFeatures"));
criminal.setOccupationId(rs.getInt("occupationId"));
criminal.setoName(rs.getString("oName"));
criminal.setPhoneNo(rs.getString("phoneNo"));
criminal.setPhoto(rs.getString("photo"));
criminal.setSkinColorId(rs.getString("skinColorId"));
criminal.setSocialSecurityNumber(rs.getInt("socialSecurityNumber"));
criminal.setWeight(rs.getDouble("weight"));
criminal.setEyeColorId(rs.getString("eyeColorId"));
criminal.setDob(rs.getDate("dob"));
criminal.setName(rs.getString("fName") +" "+ rs.getString("lName"));
crime.getCriminals().add(criminal);
}
}
return new ArrayList<Crime>(map.values());
}
}
Crime.java
public class Crime implements Serializable{
private int crimeRecNo;
private String crimeDetails;
private BigDecimal crimeLatLocation;
private BigDecimal crimeLongLocation;
private String crimeStreetLn1;
private String crimeStreetLn2;
private String crimeDate;
private String crimeTime;
private List<Citizens> victims;
private List<Citizens> criminals;
private String recordedById;
private int statusId;
private int offenceCatId;
private int offenceTypeId;
private int crimeLevelId;
private String investigatingOfficerId;
..........
Citizens.java
public class Citizens implements Serializable{
private int socialSecurityNumber;
private String fName;
private String lName;
private String oName;
private String photo;
private int countryId;
private String addLn1;
private String addLn2;
private String addLn3;
private String genderId;
private int ethnicityId;
private String skinColorId;
private String hairColorId;
private int occupationId;
private String phoneNo;
private int maritalStatusId;
private String noticeableFeatures;
private double weight;
private double height;
private int citizenTypeId;
private String eyeColorId;
private Date dob;
private String name;
错误
org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/jsp/crimeList.jsp at line 62
59: <label>${crime.crimeRecNo}</label>
60: <label>${crime.crimeDetails}</label>
61:
62: <c:forEach items="${crimes.getVictims}" var="victim">
63: <label>${victim.getName}</label>
64:
65: </c:forEach>
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:568)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1180)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:950)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause
java.lang.NumberFormatException: For input string: "getVictims"
java.lang.NumberFormatException.forInputString(Unknown Source)
java.lang.Integer.parseInt(Unknown Source)
java.lang.Integer.parseInt(Unknown Source)
javax.el.ListELResolver.coerce(ListELResolver.java:173)
javax.el.ListELResolver.getValue(ListELResolver.java:52)
org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:104)
org.apache.el.parser.AstValue.getValue(AstValue.java:183)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:185)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:1026)
org.apache.jsp.WEB_002dINF.jsp.crimeList_jsp._jspx_meth_c_005fforEach_005f1(crimeList_jsp.java:249)
org.apache.jsp.WEB_002dINF.jsp.crimeList_jsp._jspx_meth_c_005fforEach_005f0(crimeList_jsp.java:216)
org.apache.jsp.WEB_002dINF.jsp.crimeList_jsp._jspx_meth_form_005fform_005f0(crimeList_jsp.java:164)
org.apache.jsp.WEB_002dINF.jsp.crimeList_jsp._jspService(crimeList_jsp.java:127)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1180)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:950)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
答案 0 :(得分：2)
第一次访问或稍后修改时的每个JSP文件都会被编译，每个JSP文件都会像crimeList_jsp.java一样。
org.apache.jsp.WEB_002dINF.jsp.crimeList_jsp._jspx_meth_c_005fforEach_005f1(crimeList_jsp.java:249)
org.apache.jsp.WEB_002dINF.jsp.crimeList_jsp._jspx_meth_c_005fforEach_005f0(crimeList_jsp.java:216)
org.apache.jsp.WEB_002dINF.jsp.crimeList_jsp._jspx_meth_form_005fform_005f0(crimeList_jsp.java:164)
org.apache.jsp.WEB_002dINF.jsp.crimeList_jsp._jspService(crimeList_jsp.java:127)
我建议您在Apache Tomcat中观察crimeList.jsp以上行的代码。
示例路径如下：
d：\ Apache的Tomcat的\工作\卡塔利娜\本地主机\ myAppName \组织\阿帕奇\ JSP \
此处myAppName将是您的应用程序名称。
<c:forEach items="${crimes.victims}" var="victim">
<label>${victim.name}</label>
</c:forEach>
答案 1 :(得分：1)
而不是crimes.getVictims，这应该被称为crimes.victims，EL将负责插入get部分（现在它正在寻找getGetVictims）