迭代任意8种数据类型数组
写的是一个jstl标签处理器类,可以迭代任意数组
import java.io.IOException; import java.lang.reflect.Array; import java.util.ArrayList; import java.util.Collection; import java.util.Iterator; import javax.servlet.jsp.JspException; import javax.servlet.jsp.tagext.SimpleTagSupport; public class ForeachTag extends SimpleTagSupport { private String var; private Object items; private Collection collection; public void setItems(Object items) { this.items = items; if (items.getClass().isArray()) { this.collection = new ArrayList(); int length = Array.getLength(items); for (int i = 0; i < length; i++) { Object value = Array.get(items, i); this.collection.add(value); } } } public void setVar(String var) { this.var = var; } public void setCollection(Collection collection) { this.collection = collection; } @Override public void doTag() throws JspException, IOException { Iterator it = this.collection.iterator(); while (it.hasNext()) { Object value = it.next(); this.getJspContext().setAttribute(var, value); this.getJspBody().invoke(null); } } }