我是java的新手，我正在尝试使用spring-mvc和hibernate编写应用程序。
我收到错误 ＆＃34;由以下引起：java.lang.IllegalStateException：BindingResult和bean名称＆＃39;命令＆＃39;都没有普通目标对象。可用作请求属性＆＃34; 当我尝试使用数据库中的元素填充下拉列表时，在JSP文件中
@Controller
public class MetalController {
@Autowired
MtMetalService mtMetalService;
@Autowired
MtFormulaService mtFormulaService;
@RequestMapping(value = "/", method = RequestMethod.GET)
public ModelAndView homePage() {
ModelAndView model =new ModelAndView("homepage");
return model;
}
@RequestMapping(value = "/inputmetal.html", method = RequestMethod.GET)
public ModelAndView metalInputForm() {
MtFormula mtFormula = new MtFormula();
List<MtFormula> formulalist = mtFormulaService.getAll(mtFormula);
ModelAndView model =new ModelAndView("metalinput");
model.addObject(formulalist);
for (MtFormula x: formulalist) {
System.out.println(x.getFormulaCode());
}
return model;
}
@RequestMapping(value = "/metalviewinput.html", method = RequestMethod.GET)
public ModelAndView metalViewForm() {
ModelAndView model =new ModelAndView("metalviewinput");
return model;
}
@RequestMapping(value="/createmetal.html", method = RequestMethod.POST)
public ModelAndView createMetal(@ModelAttribute("mtMetal") MtMetal mtMetal) {
mtMetalService.persist(mtMetal);
ModelAndView model =new ModelAndView("redirect:/inputmetal.html?success=true");
return model;
}
@RequestMapping(value="/viewmetal.html", method={ RequestMethod.GET, RequestMethod.POST})
public ModelAndView McMetalView(
@RequestParam("MetalCode") String metalCode) {
MtMetal mtMetal = new MtMetal();
mtMetal = mtMetalService.getOne(mtMetal, metalCode);
ModelAndView model =new ModelAndView("metalview");
model.addObject("msg", "Metal input form");
model.addObject(mtMetal);
return model;
}
@RequestMapping(value = "/metallist.html", method={ RequestMethod.GET})
public ModelAndView metalListView() {
MtMetal mtMetal = new MtMetal();
List<MtMetal> mtMetalList = mtMetalService.getAll(mtMetal);
ModelAndView model = new ModelAndView("metallistview");
model.addObject(mtMetalList);
return model;
}
}
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib prefix="form" uri="http://www.springframework.org ags/form"%>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>
<form:form method="post" action="/labcontrol/createmetal.html">
<c:if test="${param.success eq true}"></c:if> Metal save - Successful
<table border=1>
<tr><th>Metal details entry form</th></tr>
<tr><td>Metal Code1 </td><td> <input type=text
name="metalCode"/></td></tr>
<tr><td>Metal Description </td><td> <input type=text
name="metalDesc"/></td></tr>
<tr><td>Metal Unit of measure </td><td> <input type=text
name="metalUnit"/></td></tr>
<tr><td>Loss Formula </td><td><form:select
path="formulalist">
<form:option
value="-" label="--Please Select"/>
<form:options
items="${formulalist}" itemValue="formulaCode"
itemLabel="formula"/>
</form:select> </td></tr>
<tr><td>Treatment recovery </td><td> <input type=number
name="treatmentRecovery"/></td></tr>
<tr><td>Salable mass </td><td> <input type=number
name="saleableMass"/></td></tr>
<tr><td>Pricing unit </td><td> <input type=number
name="pricePerUnit"/></td></tr>
<tr><td>Gross value </td><td> <input type=number
name="grossValue"/></td></tr>
<tr><td><input type="submit" value="Save record"></td></tr>
</table>
</form:form>
答案 0 :(得分：0)
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib prefix="form" uri="http://www.springframework.org ags/form"%>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>
<form:form method="post" action="/labcontrol/createmetal.html">
<c:if test="${param.success eq true}"></c:if> Metal save - Successful
<table border=1>
<tr><th>Metal details entry form</th></tr>
<tr><td>Metal Code1 </td><td> <input type=text
name="metalCode"/></td></tr>
<tr><td>Metal Description </td><td> <input type=text
name="metalDesc"/></td></tr>
<tr><td>Metal Unit of measure </td><td> <input type=text
name="metalUnit"/></td></tr>
<tr><td>Loss Formula </td><td><form:select
path="formulalist">
<form:option
value="-" label="--Please Select"/>
<form:options
items="${formulalist}" itemValue="formulaCode"
itemLabel="formula"/>
</form:select> </td></tr>
<tr><td>Treatment recovery </td><td> <input type=number
name="treatmentRecovery"/></td></tr>
<tr><td>Salable mass </td><td> <input type=number
name="saleableMass"/></td></tr>
<tr><td>Pricing unit </td><td> <input type=number
name="pricePerUnit"/></td></tr>
<tr><td>Gross value </td><td> <input type=number
name="grossValue"/></td></tr>
<tr><td><input type="submit" value="Save record"></td></tr>
</table>
</form:form>}
答案 1 :(得分：0)
将表单上的modelAttribute属性设置为正确的值。
<form:form modelAttribute="" > ...
在你的情况下它应该是“mtMetal”。
在将模型属性添加到模型时，请始终为模型属性命名，以便您知道在表单中设置的内容。
答案 2 :(得分：0)
@Entity
public class MtMetal {
@Id
@GeneratedValue
private int metalId;
private String metalCode;
private String metalDesc;
private String metalUnit;
private double treatmentRecovery;
private double saleableMass;
private double pricePerUnit;
private double grossValue;
@OneToOne
private MtFormula lossFormula;
public MtFormula getLossFormula() {
return lossFormula;
}
public void setLossFormula(MtFormula lossFormula) {
this.lossFormula = lossFormula;
}
public double getTreatmentRecovery() {
return treatmentRecovery;
}
public void setTreatmentRecovery(double treatmentRecovery) {
this.treatmentRecovery = treatmentRecovery;
}
public double getSaleableMass() {
return saleableMass;
}
public void setSaleableMass(double saleableMass) {
this.saleableMass = saleableMass;
}
public double getPricePerUnit() {
return pricePerUnit;
}
public void setPricePerUnit(double pricePerUnit) {
this.pricePerUnit = pricePerUnit;
}
public double getGrossValue() {
return grossValue;
}
public void setGrossValue(double grossValue) {
this.grossValue = grossValue;
}
public String getMetalUnit() {
return metalUnit;
}
public void setMetalUnit(String metalUnit) {
this.metalUnit = metalUnit;
}
public int getMetalId() {
return metalId;
}
public void setMetalId(int metalId) {
this.metalId = metalId;
}
public String getMetalCode() {
return metalCode;
}
public void setMetalCode(String metalCode) {
this.metalCode = metalCode;
}
public String getMetalDesc() {
return metalDesc;
}
public void setMetalDesc(String metalDesc) {
this.metalDesc = metalDesc;
}
}
@Entity
public class MtFormula {
@Id
@GeneratedValue
private int formulaId;
private String formulaCode;
private String formulaDesc;
private double formulaRate;
public int getFormulaId() {
return formulaId;
}
public void setFormulaId(int formulaId) {
this.formulaId = formulaId;
}
public String getFormulaCode() {
return formulaCode;
}
public void setFormulaCode(String formulaCode) {
this.formulaCode = formulaCode;
}
public String getFormulaDesc() {
return formulaDesc;
}
public void setFormulaDesc(String formulaDesc) {
this.formulaDesc = formulaDesc;
}
public double getFormulaRate() {
return formulaRate;
}
public void setFormulaRate(double formulaRate) {
this.formulaRate = formulaRate;
}
}