Spring是如何管理Hibernate和Struts的(二)

将Struts2交给Spring管理的时候需要加入一个Spring-struts.jar包

Struts2的运行依赖于容器, 所以tomcat启动时会加载在web.xml中的配置文件.

<filter>
    <filter-name>struts2>
   <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>

<filter-mapping>
    <filter-name>struts2</filter-name>
    <url-mapping>/*</url-mapping>
</filter-mapping>

这样, tomcat启动的时候,会管理struts2, 并加载classpath下的struts.xml文件.

struts.xml中的常量配置.

   struts.action.extension 扩展名,默认为.action

   struts.devMode 开发模式

   struts.custom.i18n.resources=resource     resource_zh_CN.properties resource_en_US.properties

   struts.i18n.encoding  编码格式   struts.ui.theme  自定义主题

struts.xml中包的配置.

<package name="test" namespace="/" extends="struts-default">
</package>

 package包含在struts标签中, 一个struts标签中可以有多个package. 每个包都有一个唯一的name, 和一个namespace. extends表示继承于哪个包, 并且允许多继承.

在package中配置interceptor, globleResults, globle-exception-mappings

1: 在package中配置interceptor

<interceptors>
    <interceptor name="loginInterceptor" class="org.test.LoginInterceptor" ></interceptor>
    <interceptor-stack name="default">
        <interceptor-ref name="defaultStack" ></interceptor-ref>
        <interceptor-ref name="loginInterceptor"></interceptor-ref>
    </interceptor-stack>
</interceptors>
<default-interceptor-ref name="default"></default-interceptor-ref>

说明一下, 首先在package中的interceptors标签内声明一个interceptor , name属性必须是唯一的.

   然后在<interceptor-stack>中配置<interceptor-ref> 在配置前必须声明defaultstack.

当配置好interceptor-stack后, 需要配置缺省的interceptor

<default-interceptor-ref name="default" ></default-interceptor-ref>

2: 配置globle-results

<globle-results>
  <result name="list" type="redirect"></result>
  <result name="save" type="redirect-action"></result>
</globle_results>

默认的retult type是dispatcher.

Struts2自定义返回类型.

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.Result;
import com.tiros.caredog.cd.action.ImageAction;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;
/**
 * image Result
 * @author songzj
 *
 */
public class ImageResult implements Result {

	public void execute(ActionInvocation ai) throws Exception {

		ImageAction action = (ImageAction) ai.getAction();

		HttpServletResponse response = ServletActionContext.getResponse();

		response.setHeader("Cash", "no cash");

		response.setContentType(action.getContentType());

		response.setContentLength(action.getContentLength());

		response.getOutputStream().write(action.getImageBytes());

		//response.getOutputStream().flush();
		
		response.getOutputStream().close();

	}

}
<result-types>
      <result-type name="ValidateImage"    class="com.tiros.caredog.cd.util.ImageResult" />
</result-types>

  

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.util.Random;

import com.tiros.caredog.cd.util.Constent;

public class ImageAction extends CommonAction {

	/**
	 * 
	 * 用于随机生成验证码的数据源
	 * 
	 */

	private static final char[] source = new char[] {

	'1', '2', '3', '4', '5', '6', '7', '8', '9', '0'

	};

	/**
	 * 
	 * 用于随机打印验证码的字符颜色
	 * 
	 */

	private static final Color[] colors = new Color[] {

	Color.RED, Color.BLUE, Color.BLACK

	};

	/**
	 * 
	 * 用于打印验证码的字体
	 * 
	 */

	private static final Font font = new Font("宋体", Font.ITALIC, 15);

	/**
	 * 
	 * 用于生成随机数的随机数生成器
	 * 
	 */

	private static final Random rdm = new Random();

	private String text = "";

	private byte[] bytes = null;

	private String contentType = "image/png";

	public byte[] getImageBytes() {
		return this.bytes;
	}

	public String getContentType() {
		return this.contentType;
	}

	public void setContentType(String value) {
		this.contentType = value;
	}

	public int getContentLength() {
		return bytes.length;
	}

	/**
	 * 
	 * 生成长度为4的随机字符串
	 * 
	 */

	private void generateText() {
		char[] source = new char[4];
		for (int i = 0; i < source.length; i++) {
			source[i] = ImageAction.source[rdm
					.nextInt(ImageAction.source.length)];
		}
		this.text = new String(source);
		// 设置Session
		super.getSession().setAttribute(Constent.VALIDATE_CODE_KEY, this.text);
	}

	/**
	 * 
	 * 在内存中生成打印了随机字符串的图片
	 * 
	 * @return 在内存中创建的打印了字符串的图片
	 * 
	 */
	private BufferedImage createImage() {
		int width = 40;
		int height = 15;
		BufferedImage image = new BufferedImage(width, height,
				BufferedImage.TYPE_INT_RGB);
		Graphics g = image.getGraphics();
		g.setColor(Color.WHITE);
		g.fillRect(0, 0, width, height);
		g.setFont(font);
		for (int i = 0; i < this.text.length(); i++) {
			g.setColor(colors[rdm.nextInt(colors.length)]);
			g.drawString(this.text.substring(i, i + 1), 2 + i * 8, 12);
		}
		g.dispose();
		return image;
	}

	/**
	 * 
	 * 根据图片创建字节数组
	 * 
	 * @param image
	 *            用于创建字节数组的图片
	 * 
	 */
	private void generatorImageBytes(BufferedImage image) {
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		try {
			javax.imageio.ImageIO.write(image, "jpg", bos);
			this.bytes = bos.toByteArray();
		} catch (Exception ex) {
		} finally {
			try {
				bos.close();
			} catch (Exception ex1) {
			}
		}
	}

	/**
	 * 
	 * 被struts2过滤器调用的方法
	 * 
	 * @return 永远返回字符串"image"
	 * 
	 */
	public String doDefault() {
		this.generateText();
		BufferedImage image = this.createImage();
		this.generatorImageBytes(image);
		return "image";
	}

}
<action name="va_ValidateImage" class="ImageAction"
			method="doDefault">
			<result name="image" type="ValidateImage" />
		</action>
<!-- 验证码管理 -->
	<bean id="ImageAction"
		class="com.cd.action.ImageAction" scope="prototype">
	</bean>

  

   在上面的代码中我们可以发现, struts.xml中定义的action name ="va_validateImage" class="ImageAction"

这个ImageAction从哪里来呢? 从applicationContext.xml中来. 因为Spring管理了所有的Bean, 所以ImageAction会交由Spring管理. 当用到ImageAction的时候会直接从Spring的工厂bean中得到.

  

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