paginationtag.java

企业人力资源管理

package com.y2.hr.human.common;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.tagext.BodyTagSupport;

/**
 * 自定义标签类,用于生成分页栏
 * 
 * @author yangjiahui
 * 
 */
public class PaginationTag extends BodyTagSupport {

	/**
	 * 一页可以放几条记录
	 */
	private int pageSize;
	/**
	 * 当前页是第几页
	 */
	private int currPageId;
	/**
	 * 一共有几条
	 */
	private int recordCount;
	/**
	 * 生成的层的宽度
	 */
	private String width;
	/**
	 * 生成的层的高度
	 */
	private String height;
	/**
	 * 生成的层的背景
	 */
	private String bgColor;
	/**
	 * 点击链接的路径
	 */
	private String url;

	@Override
	public int doAfterBody() throws JspException {
		// TODO Auto-generated method stub
		try {
			BodyContent con = super.getBodyContent();
			JspWriter out = con.getEnclosingWriter();
			// 总页数
			int pageCount = (int) Math.ceil((double) recordCount / pageSize);
			StringBuffer buf = new StringBuffer();
			buf
					.append("<div style='border:0px solid black;text-align:right;font-size:12px;");
			if (bgColor != null) {
				buf.append("background-color: " + bgColor + ";");
			}
			if (width != null) {
				buf.append("width: " + width + ";");
			} else {
				buf.append("width: 100%;");
			}
			if (height != null) {
				buf.append("height: " + height + ";");
			}
			buf.append("'>");
			buf.append("共有<font color='red'>" + recordCount
					+ "</font>条记录&nbsp;&nbsp;");
			buf.append("共<font color='red'>" + pageCount
					+ "</font>页&nbsp;&nbsp;");
			buf.append("当前第<font color='red'>" + currPageId
					+ "</font/>页&nbsp;&nbsp;");
			if (currPageId == 1) {
				buf.append("<font color='#b0c4de'>首页</font>&nbsp;&nbsp;");
				buf.append("<font color='#b0c4de'>上一页</font>&nbsp;&nbsp;");
			} else {
				buf.append("<a href='" + url
						+ "&currPageId=1'>首页</a>&nbsp;&nbsp;");
				buf.append("<a href='" + url + "&currPageId="
						+ (currPageId - 1) + "'>上一页</a>&nbsp;&nbsp;");
			}
			if (pageCount == currPageId) {
				buf.append("<font color='#b0c4de'>下一页</font>&nbsp;&nbsp;");
				buf.append("<font color='#b0c4de'>尾页</font>&nbsp;&nbsp;");
			} else {
				buf.append("<a href='" + url + "&currPageId="
						+ (currPageId + 1) + "'>下一页</a>&nbsp;&nbsp;");
				buf.append("<a href='" + url + "&currPageId=" + pageCount
						+ "'>尾页</a>&nbsp;&nbsp;");
			}
			buf
					.append("跳转到<input type='text' name='pageId' id='pageId' maxlength='3' size='2' style='width:20px;'/>");
			buf
					.append(" <img src='/hr/images/main/go.bmp' onclick='pagination()'/>&nbsp;&nbsp;");
			buf.append("</div>");
			// 生成验证函数
			buf
					.append("<script type='text/javascript' language='javascript'>                                ");
			buf
					.append("               function pagination(){                                                ");
			buf.append("               var maxId = " + pageCount
					+ ";                                            ");
			buf.append("               var currId = " + currPageId
					+ ";                                          ");
			buf
					.append("               var pageId = document.getElementById('pageId').value;                 ");
			buf
					.append("               if(!pageId.match(/^\\d+$/)){                                          ");
			buf
					.append("                    alert('请您务必输入数字!');                                         ");
			buf
					.append("                }else if(pageId>maxId){                                              ");
			buf
					.append("                    alert('一共只有'+maxId+'页!');                                              ");
			buf
					.append("                }else if(pageId == currId){                                          ");
			buf
					.append("                    alert('您的期望页面已是当前页!');                                    ");
			buf
					.append("                }else if(pageId <1){                                                 ");
			buf
					.append("                    alert('您已到达首页!');                                            ");
			buf
					.append("                }else{                                                               ");
			buf.append("              	location.href='" + url
					+ "&currPageId='+pageId;   }   }               ");
			buf
					.append("</script>                                                                            ");
			out.print(buf.toString());
			con.clear();
		} catch (Exception ex) {
			ex.printStackTrace();
		}
		return EVAL_PAGE;
	}

	@Override
	public void setBodyContent(BodyContent b) {
		// TODO Auto-generated method stub
		super.setBodyContent(b);
	}

	public int getPageSize() {
		return pageSize;
	}

	public void setPageSize(int pageSize) {
		this.pageSize = pageSize;
	}

	public int getCurrPageId() {
		return currPageId;
	}

	public void setCurrPageId(int currPageId) {
		this.currPageId = currPageId;
	}

	public int getRecordCount() {
		return recordCount;
	}

	public void setRecordCount(int recordCount) {
		this.recordCount = recordCount;
	}

	public String getWidth() {
		return width;
	}

	public void setWidth(String width) {
		this.width = width;
	}

	public String getHeight() {
		return height;
	}

	public void setHeight(String height) {
		this.height = height;
	}

	public String getBgColor() {
		return bgColor;
	}

	public void setBgColor(String bgColor) {
		this.bgColor = bgColor;
	}

	public String getUrl() {
		return url;
	}

	public void setUrl(String url) {// 如果未带参数人为添加一个errorId
		if (url.indexOf('?') < 0) {
			url = url + "?errorId=1";
		}
		this.url = url;
	}

}