1
我使用春天mvc和百里香。 我正在使用包含輸入字段的表單。我希望我的控制器能夠接受空的字段。它表示空字符串的問題。 我試着用這個空的字符串在春天輸入形式
@InitBinder
public void initBinder(WebDataBinder binder) {
binder.registerCustomEditor(String.class, new StringTrimmerEditor(true));
}
，但它不工作。
的html頁面：
<form th:action="@{/ajouterUniversite}" method="post" id="ajouter" style="display: none">
<div>
<label>nom:</label>
<input type="text" name="nom" />
</div>
<hr/>
<label>région:</label>
<input type="text" name="region" />
<hr/>
<b>Choisir les branches dans cette université</b>
<div>
<div class="checkbox">
<label><input type="checkbox" value="" onchange="document.getElementById('math').style.display='block'"/>mathématique</label>
</div>
<div class="checkbox">
<label><input type="checkbox" value="" onchange="document.getElementById('science').style.display='block'"/>Science</label>
</div>
<div class="checkbox ">
<label><input type="checkbox" value="" onchange="document.getElementById('info').style.display='block'" />Info</label>
</div>
<div class="checkbox ">
<label><input type="checkbox" value="" onchange="document.getElementById('lettre').style.display='block'" />Lettre</label>
</div>
<div class="checkbox ">
<label><input type="checkbox" value="" onchange="document.getElementById('eco').style.display='block'" />Eco</label>
</div>
</div>
<div id="math" style="display: none" >
<label >entrer le score du bac math :</label>
<input type="number" name="scoreMath" min="120"/>
</div>
<hr/>
<div id="science" style="display: none" >
<label >entrer le score du bac science :</label>
<input type="number" name="scoreScience" min="95" />
</div>
<hr/>
<div id="info" style="display: none">
<label >entrer le score du bac info :</label>
<input type="number" name="scoreInfo" min="65" />
</div>
<hr/>
<div id="lettre" style="display: none">
<label >entrer le score du bac lettre :</label>
<input type="number" name="scoreLettre" min="50" />
</div>
<hr/>
<div id="eco" style="display: none">
<label >entrer le score du bac eco :</label>
<input type="number" name="scoreEco" min="55" />
</div>
<button type="submit" class="btn btn-primary">Save</button>
</form>
控制器：
@Controllerpublic class BanqueController {
@Autowired
private IOrient or;
@InitBinder
public void initBinder(WebDataBinder binder) {
binder.registerCustomEditor(String.class, new StringTrimmerEditor(true));
}
@RequestMapping("/operations")
public String index()
{
return "comptes";
}
@RequestMapping("/authentifier")
public String authentifier()
{
return "authentifier";
}
@RequestMapping("/pageAdmin")
public String pageAdmin(Model model, String uname,String psw)
{
if (uname.equals("admin") && psw.equals("admin")) return "admin";
else
{
model.addAttribute("exception","vérifier les paramètres !!");
return "authentifier";
}
}
@RequestMapping(value="/ajouterUniversite",method=RequestMethod.POST)
public String ajoutUniver(Model model,String nom,String region,String scoreMath,String scoreScience,String scoreEco,String scoreInfo,String scoreLettre)
{
model.addAttribute("ok","cv");
Universite u=new Universite(nom,region);
or.ajouterUniversite(nom, region, Double.parseDouble(scoreMath), Double.parseDouble(scoreScience), Double.parseDouble(scoreInfo), Double.parseDouble(scoreLettre), Double.parseDouble(scoreEco));
return "admin";
}
}
實體： Universite.class
@Entity
public class Universite implements Serializable {
@Id @GeneratedValue
private Long id_universite;
private String nom;
private String region;
public Universite() {
super();
}
public Universite(String nom, String region) {
super();
this.nom = nom;
this.region = region;
}
public String getNom() {
return nom;
}
public void setNom(String nom) {
this.nom = nom;
}
public String getRegion() {
return region;
}
public void setRegion(String region) {
this.region = region;
}
public Long getId_universite() {
return id_universite;
}
public void setId_universite(Long id_universite) {
this.id_universite = id_universite;
}
}
Score.java：
@Entity
public class Score {
@Id @GeneratedValue
private Long code_score;
private double scoreMath;
private double scoreScience;
private double scoreInfo;
private double scoreEco;
private double scoreLettre;
@ManyToOne
@JoinColumn(name="code_universite")
private Universite universite;
public double getScoreMath() {
return scoreMath;
}
public void setScoreMath(double scoreMath) {
this.scoreMath = scoreMath;
}
public double getScoreScience() {
return scoreScience;
}
public void setScoreScience(double scoreScience) {
this.scoreScience = scoreScience;
}
public double getScoreInfo() {
return scoreInfo;
}
public void setScoreInfo(double scoreInfo) {
this.scoreInfo = scoreInfo;
}
public double getScoreEco() {
return scoreEco;
}
public void setScoreEco(double scoreEco) {
this.scoreEco = scoreEco;
}
public double getScoreLettre() {
return scoreLettre;
}
public void setScoreLettre(double scoreLettre) {
this.scoreLettre = scoreLettre;
}
public Universite getUniversite() {
return universite;
}
public void setUniversite(Universite universite) {
this.universite = universite;
}
public Score() {
super();
}
public Score(double scoreMath, double scoreScience, double scoreInfo, double scoreEco, double scoreLettre,
Universite universite) {
super();
this.scoreMath = scoreMath;
this.scoreScience = scoreScience;
this.scoreInfo = scoreInfo;
this.scoreEco = scoreEco;
this.scoreLettre = scoreLettre;
this.universite = universite;
}
public Long getCode_score() {
return code_score;
}
public void setCode_score(Long code_score) {
this.code_score = code_score;
}
}
錯誤是：
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Sat Apr 22 08:19:00 CEST 2017
There was an unexpected error (type=Internal Server Error, status=500).
empty String
沒有在日誌？ –
java.lang.NullPointerException：null –
Where？什麼線？顯示完整的堆棧跟蹤。或者只是閱讀：[什麼是NullPointerException，以及如何解決它？]（http://stackoverflow.com/q/218384/5221149） – Andreas