Struts中point道String的类型转换.doc

1、Struts类型转换自定义类型Pointpublic class Point private int x; private int y; /省略getter and setterStruts Action：public class PointAction extends ActionSupport private Point point; .客户端输入: 这样，从客户端传过来point的String值，不能直接set到PointAction中的point对象中。同时，输出point对象时，直接调用getter也是不行的。这时，就需要一个类型转换器，实现Point类与String之间的转换。可以继承Struts中的ognl.DefaultTypeConverter实现。/StrutsHelloWorld/src/wintys/struts2/converter/PointConverter.java:package wintys.struts2.converter;import java.util.Map;import ognl.DefaultTypeConverter;public class PointConverter extends DefaultTypeConverter SuppressWarnings(unchecked) Override public Object convertValue(Map context, Object value, Class toType) /String = Point if(toType = Point.class) /获取request string的字符串数组 String params = (String)value; String param = params0; String points = param.split(,); Point point = new Point(); point.setX(Integer.parseInt(points0); point.setY(Integer.parseInt(points1); return point; /Point = String if(toType = String.class) Point point = (Point)value; int x = point.getX(); int y = point.getY(); return +x+,+y+; return null; 同时，还需要一个配置文件(须跟PointAction在同一目录下)PointAperties(名称为XXXAperties)来告诉Struts2 PointAction中属性使用哪一个转换器类。 PointAperties:point=wintys.struts2.converter.PointConverter2、Struts全局类型转换 对于每一个属性应用转换器，当属性过多时会显得很繁琐，这时可以使用Struts全局类型转换。全局类型转换器名称为perties，与struts.xml同在classes目录下。perties:#global converter settings#class to be converted = converterwintys.struts2.converter.Point=wintys.struts2.converter.PointConverter3、Struts集合类型转换 当PointAction中的属性是集合类型，跟非集合类型类似。 public class PointAction extends ActionSupport private List points; . 转换器类可以继承org.apache.struts2.util.StrutsTypeConverter，实际上StrutsTypeConverter继承于 ognl.DefaultTypeConverter。/StrutsHelloWorld/src/wintys/struts2/converter/StrutsPointConverter.java:package wintys.struts2.converter;import java.util.ArrayList;import java.util.List;import java.util.Map;import org.apache.struts2.util.StrutsTypeConverter;/* * Struts类型转换: StrutsTypeConverter 继承于 ognl.DefaultTypeConverter * author Winty * version 2009-07-14 * */SuppressWarnings(unchecked)public class StrutsPointConverter extends StrutsTypeConverter Override public Object convertFromString(Map context, String values, Class toClass) List points = new ArrayList(); for(String value : values) String p = value.split(,); Point point = new Point(); point.setX(Integer.valueOf(p0); point.setY(Integer.valueOf(p1); points.add(point); return points; Override public String convertToString(Map context, Object o) List points = (List)o; StringBuilder sb = new StringBuilder(); sb.append(); for(Point p : points) sb.append(); sb.append(p.getX(); sb.append(,); sb.append(p.getY(); sb.append() ); sb.append(); return sb.toString(); 当然也需要在PointAction-conversion-properties中配置:PointAction-conversion-properties:#property = converterpoint=wintys.struts2.converter.PointConverterpoints=wintys.struts2.converter.StrutsPointConverter4、详细内容:/StrutsHelloWorld/WebRoot/converter/input.jsp:其中可以换成 此时，Point类无需类型转换，Struts会自己去找point对象的x与y的setter方法。当输出时，只需重写Point类的toString()方法即可。 请以逗号分割输入点的坐标，如:5,3 /StrutsHelloWorld/WebRoot/converter/output.jsp: /StrutsHelloWorld/src/struts.xml: /converter/output.jsp /StrutsHelloWorld/WebRoot/WEB-INF/web.xml: MyStruts2 org.apache.struts2.dispatcher.FilterDispatcher MyStruts2 /* /StrutsHelloWorld/src/wintys/struts2/converter/Point.java:package wintys.struts2.converter;/* * * author Winty * version 2009-07-12 */public class Point private int x; private int y; public int getX() return x; public void setX(int x) this.x = x; public int getY() return y; public void setY(int y) this.y = y; /StrutsHelloWorld/src/wintys/struts2/converter/PointAction.java:package wintys.struts2.converter;import java.util.Date;import java.util.List;import com.opensymphony.xwork2.ActionSupport;/* * * author Winty * verion 2009-07-12 */SuppressWarnings(serial)public class PointAction extends ActionSupport private Point point; private List points;/集合类型的转换 private int age; private String name; private Date birthday; public Point getPoint() return point; public void setPoint(Point point) this.point = point; public int getAge() return age; public void setAge(int age) this.age = age; public String getName() return name; public void setName(String name) = name; public Date getBirthday() return birthday