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我的項目有下一個問題需要研究。我需要在CDI的簡單servlet項目中使用BeansValidation。我想讓bean驗證與使用範圍註釋標註的cdi bean一起工作，但現在，當我嘗試驗證這些bean時（即使它們有一些錯誤），驗證程序聲稱完全沒有錯誤。CDI和servlet應用程序中的BeanValidation
另外，將EL語言的bean屬性設置爲請求中的值將會很好，這似乎適用於具有範圍註釋的bean，但它不適用於其他任何bean。
我認爲這是CDI代理的問題，但我不知道如何解決它。我使用maven構建我的應用程序並將其部署到Jboss 7.1.1.Final。
這裏是我的項目全部來源：
豆用範圍註釋：
package pl.lab3.bean;
import javax.enterprise.context.RequestScoped;
import javax.inject.Named;
import javax.validation.constraints.Size;
@Named
@RequestScoped
public class Scoped {
@Size(max = 2)
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
豆無範圍註釋：
package pl.lab3.bean;
import javax.inject.Named;
import javax.validation.constraints.Size;
@Named
public class Data {
@Size(max = 2)
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
的Servlet：
package pl.lab3.servlet;
import pl.lab3.bean.Data;
import pl.lab3.bean.Scoped;
import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.inject.Inject;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.validation.ConstraintViolation;
import javax.validation.Validator;
import java.io.IOException;
import java.util.Set;
public class ServletDispatcher extends HttpServlet {
@Inject
private Validator validator;
@Inject
private ELContext elContext;
@Inject
private ExpressionFactory expressionFactory;
@Inject
private Scoped scoped;
@Inject
private Data data;
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,
IOException {
this.request(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,
IOException {
this.request(request, response);
}
private void request(HttpServletRequest request, HttpServletResponse response)
throws IOException {
try {
expressionFactory.createValueExpression(elContext, "${scoped.name}", String.class)
.setValue(elContext, "test");
String goodValue = scoped.getName(); //returns test, as expected
//but in debugger it's still null(first screen)
Set<ConstraintViolation<Scoped>> emptySet = validator.validate(scoped); //doesn't work, returns empty set
scoped.setName("test2");
String goodValue2 = scoped.getName(); //obviously works, but still null in debugger(same first screen, just nothing happened)
Set<ConstraintViolation<Scoped>> emptySet2 =
validator.validate(scoped); //doesn't work too, returns empty set
expressionFactory.createValueExpression(elContext, "${data.name}", String.class)
.setValue(elContext, "test");
String badValue = data.getName(); //above doesn't work, and in debugger too(second screen)
Set<ConstraintViolation<Data>> emptySet3 = validator.validate(data); //empty set...
data.setName("test2");
String goodValue3 = data.getName(); //obviously works, and I can see good value in debugger(third screen)
Set<ConstraintViolation<Data>> errors = validator.validate(data); //and here I've got expected error
} catch (Exception e) {
e.printStackTrace();
}
}
}
Scren從debbuger鏡頭在servlet代碼提到：
屏蔽1：
屏蔽2：
屏幕3：
還有一些（我認爲）不太重要的文件：
的web.xml：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>pl.lab3.servlet.ServletDispatcher</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
的beans.xml
<?xml version="1.0"?>
<beans xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://jboss.org/schema/cdi/beans_1_0.xsd">
</beans>
的pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>lab</groupId>
<version>1.0</version>
<artifactId>lab3-validation</artifactId>
<packaging>war</packaging>
<name>lab3-validation</name>
<dependencies>
<dependency>
<groupId>org.jboss.seam.validation</groupId>
<artifactId>seam-validation</artifactId>
<version>3.1.0.Final</version>
</dependency>
<dependency>
<groupId>org.jboss.spec</groupId>
<artifactId>jboss-javaee-web-6.0</artifactId>
<version>3.0.2.Final</version>
<type>pom</type>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.jboss.weld.servlet</groupId>
<artifactId>weld-servlet</artifactId>
<version>2.0.1.Final</version>
</dependency>
</dependencies>
<repositories>
<repository>
<id>JBoss repository</id>
<url>http://repository.jboss.org/nexus/content/groups/public/</url>
</repository>
</repositories>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.0</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
<finalName>validation</finalName>
</build>
</project>
您的解決方法正常工作。但是，物業級別註釋也會很好。我試圖通過實際對象來驗證方法，而不是cdi代理。我通過調用具有適當參數的BeanManager.getContext（）。get（）來接收真實對象，然後它可以工作。對於好的和不可見的解決方案，我認爲自定義驗證器生產者將會很好，在這個生產者中，我將把代理返回給驗證器對象，並且在這個代理中，當方法的第一個參數是cdi代理時，我會將其更改爲實際對象。但問題是如何檢查某個對象是cdi代理還是真實對象？ – gandalfml