pagination.java

利用STRUTS2+SPRING+HIBERNATE/IBATIS建立的基本开发框架

package com.sunwah.baseapp.servlet;

import java.io.IOException;
import java.io.Writer;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.components.Component;

import com.opensymphony.xwork2.util.ValueStack;

/**
 * 分页组件
 * 
 */
public class Pagination extends Component {
	private HttpServletRequest request;

	// 当前页
	private String currentPage;
	// 总页数
	private String total;
	private String styleClass;
	private String theme;
	// 参数(多个参数以逗号分隔)
	private String includes;
	// 查询URL
	private String url;

	public String getTheme() {
		return theme;
	}

	public void setTheme(String theme) {
		this.theme = theme;
	}

	public String getIncludes() {
		return includes;
	}

	public void setIncludes(String includes) {
		this.includes = includes;
	}

	public String getStyleClass() {
		return styleClass;
	}

	public void setStyleClass(String styleClass) {
		this.styleClass = styleClass;
	}

	public String getCurrentPage() {
		return currentPage;
	}

	public void setCurrentPage(String currentPage) {
		this.currentPage = currentPage;
	}

	public String getTotal() {
		return total;
	}

	public void setTotal(String total) {
		this.total = total;
	}

	public String getUrl() {
		return url;
	}

	public void setUrl(String url) {
		this.url = url;
	}

	public Pagination(ValueStack arg0, HttpServletRequest request) {
		super(arg0);
		this.request = request;
	}

	@Override
	public boolean start(Writer writer) {
		boolean result = super.start(writer);
		try {
			StringBuilder str = new StringBuilder();
			Map cont = this.getStack().getContext();

			// 从ValueStack中取出数值
			Object obj = this.getStack().findValue(currentPage);
			currentPage = String.valueOf((Integer) obj);
			obj = this.getStack().findValue(total);
			total = String.valueOf((Integer) obj);

			if (total.equals("0"))
				currentPage = total;

			StringBuffer perUrl = new StringBuffer("");
			if (includes != null) {
				String[] perm = includes.split(",");
				for (int i = 0; i < perm.length; i++) {
					String permName = perm[i];
					Object obje = this.getStack().findValue(permName);
					if (obje == null)
						continue;
					String vType = obje.getClass().toString();

					vType = vType.substring(vType.lastIndexOf(".") + 1, vType
							.length());
					perUrl.append("&" + permName);
					if (vType.equals("String")) {
						String tmp = (String) this.getStack().findValue(
								permName);
						perUrl.append("=" + tmp);
					} else if (vType.equals("Long")) {
						Long tmp = (Long) this.getStack().findValue(permName);
						perUrl.append("=" + tmp);
					} else if (vType.equals("Float")) {
						Float tmp = (Float) this.getStack().findValue(permName);
						perUrl.append("=" + tmp);
					} else if (vType.equals("Integer")) {
						Integer tmp = (Integer) this.getStack().findValue(
								permName);
						perUrl.append("=" + tmp);
					} else if (vType.equals("Boolean")) {
						Boolean tmp = (Boolean) this.getStack().findValue(
								permName);
						perUrl.append("=" + tmp);
					}
				}
			}

			Integer cpageInt = Integer.valueOf(currentPage);
			str.append("<span ");
			if (styleClass != null) {
				str.append(" class='" + styleClass + "'>");
			} else {
				str.append(">");
			}

			if (theme == null || "text".equals(theme)) {
				// 当前页与总页数相等
				if (currentPage.equals(total)) {
					// 如果total = 1，则无需分页，显示“[第1页] [共1页]”
					if ("1".equals(total) || "0".equals(total)) {
						str.append("&lt&lt首 页&nbsp;&lt上一页&nbsp;");
						str.append(currentPage + "/" + total + "&nbsp;");
						str.append("下一页&gt;&nbsp;尾 页&gt;&gt;");
					} else {
						// 到达最后一页,显示“[首页] [上一页] [末页]”
						str.append("<a href='" + url + "?currentPage=1"
								+ perUrl + "'>&lt&lt首 页&nbsp;</a> ");
						str.append("<a href='" + url + "?currentPage="
								+ (cpageInt - 1) + perUrl + "'>&lt;上一页</a>");
						str.append(currentPage + "/" + total + "&nbsp;");
						str.append("下一页&gt;&nbsp;");
						str.append("尾 页&gt;&gt;");
					}
				} else {
					// 当前页与总页数不相同
					if ("1".equals(currentPage)) {
						str.append("&lt&lt首 页&nbsp;");
						str.append("&lt上一页&nbsp;");
						str.append(currentPage + "/" + total + "&nbsp;");
						str.append("<a href='" + url + "?currentPage="
								+ (cpageInt + 1) + perUrl
								+ "'>下一页&gt;&nbsp;</a>");
						str.append("<a href='" + url + "?currentPage=" + total
								+ perUrl + "'>尾 页&gt;&gt;</a>");
					} else {
						// 不是第一页，显示“[首页] [上一页] [下一页] [末页]”
						str.append("<a href='" + url + "?currentPage=1"
								+ perUrl + "'>&lt&lt首 页&nbsp;</a>");
						str.append("<a href='" + url + "?currentPage="
								+ (cpageInt - 1) + perUrl
								+ "'>&lt;上一页&nbsp;</a>");
						str.append(currentPage + "/" + total + "&nbsp;");
						str.append("<a href='" + url + "?currentPage="
								+ (cpageInt + 1) + perUrl
								+ "'>下一页&gt;&nbsp;</a>");
						str.append("<a href='" + url + "?currentPage=" + total
								+ perUrl + "'>尾 页&gt;&gt;</a>");
					}
				}
			}
			str.append("</span>");
			writer.write(str.toString());
		} catch (IOException ex) {
			Logger.getLogger(Pagination.class.getName()).log(Level.SEVERE,
					null, ex);
		}
		return result;
	}
}