通信分页02

目录

1.pagebean改造

2.助手类

3.关于字符编码

4.界面展示

1.主界面

2.查询

 3.到页数

1.pagebean改造

//	保存上次地址
	private String URL;
//	保存上次查询条件
	private Map parameterMap=new HashMap();
	
	//最大页
	public int maxPage() {
		return this.total%this.rows==0?this.total/this.rows:this.total/this.rows+1;
	}
	
//	上一页
	public int previousPage() {
		return this.page > 1 ? this.page-1:this.page;
	}
	
//	下一页
	public int nextPage() {
		return this.page < this.maxPage() ? this.page+1:this.page;
	}
	
//	初始化
	public void setRequest(HttpServletRequest request) {
		this.setPage(request.getParameter("page"));
		this.setRows(request.getParameter("rows"));
		this.setPagination(request.getParameter("pagination"));
		this.setURL(request.getRequestURI().toString());
		this.setParameterMap(request.getParameterMap());
	}
//============================================	
	
	
	
	
	private void setPagination(String parameter) {
		if(StringUtils.isNotBlank(parameter)) {
			this.setPagination("false".equals(parameter));
		}
		
	}

	private void setRows(String rows) {
		if(StringUtils.isNotBlank(rows)) {
			this.setRows(Integer.valueOf(rows));
		}
		
}

	public void setPage(String page) {
		if(StringUtils.isNotBlank(page)) {
//		set自动生成的方法
			this.setPage(Integer.valueOf(page));
		}
		
}

	public String getURL() {
		return URL;
	}

	public void setURL(String uRL) {
		URL = uRL;
	}

	public Map getParameterMap() {
		return parameterMap;
	}

	public void setParameterMap(Map parameterMap) {
		this.parameterMap = parameterMap;
	}

2.助手类

package com.hz.tag;

import javax.servlet.jsp.tagext.BodyTagSupport;
import java.io.IOException;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

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

import com.hz.util.PageBean;
public class Pagetag extends BodyTagSupport{
private PageBean pageBean;
	
	public PageBean getPageBean() {
		return pageBean;
	}

	public void setPageBean(PageBean pageBean) {
		this.pageBean = pageBean;
	}

	@Override
	public int doStartTag() throws JspException {
		JspWriter out = pageContext.getOut();
		try {
			out.print(toHTML());
		} catch (IOException e) {
			e.printStackTrace();
		}
		return super.doStartTag();
	}

	private String toHTML() {
		StringBuffer sb = new StringBuffer();
//		隐藏的form表单，作用保存在上一次查询条件
	   sb.append("
");
	   sb.append("   ");
	   Map parameterMap = pageBean.getParameterMap();
	   if(parameterMap !=null && parameterMap.size()>0) {
		   Set> entrySet = parameterMap.entrySet();
		   for (Entry entry : entrySet) {
			String key = entry.getKey();
			String[] values = entry.getValue();
			if(!"page".equals(key)) {
				for (String value : values) {
					sb.append("   ");				
				}
			}
		}
	  }
	    sb.append("");
//		分页条
		sb.append("
");
		sb.append(" 
首页
");
		sb.append("
<
");
		sb.append("
"+pageBean.getPage()+"
");
		sb.append("
>
");
		sb.append("
尾页
");
		sb.append("
到第页
");
		sb.append("
确定
");
		sb.append("
共"+pageBean.getTotal()+"条
");
		sb.append("
");
//		分页js代码
		sb.append("");
		return sb.toString();
	}
}

3.关于字符编码

package com.hz.util;

import java.io.IOException;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


@WebFilter("/book/*")
public class EncodingFiter implements Filter {

	private String encoding = "UTF-8";// 默认字符集

	public EncodingFiter() {
		super();
	}

	public void destroy() {
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse res = (HttpServletResponse) response;

		// 中文处理必须放到 chain.doFilter(request, response)方法前面
		res.setContentType("text/html;charset=" + this.encoding);
		if (req.getMethod().equalsIgnoreCase("post")) {
			req.setCharacterEncoding(this.encoding);
		} else {
			Map map = req.getParameterMap();// 保存所有参数名=参数值(数组)的Map集合
			Set set = map.keySet();// 取出所有参数名
			Iterator it = set.iterator();
			while (it.hasNext()) {
				String name = (String) it.next();
				String[] values = (String[]) map.get(name);// 取出参数值[注：参数值为一个数组]
				for (int i = 0; i < values.length; i++) {
					values[i] = new String(values[i].getBytes("ISO-8859-1"),
							this.encoding);
				}
			}
		}

		chain.doFilter(request, response);
	}

	public void init(FilterConfig filterConfig) throws ServletException {
		String s = filterConfig.getInitParameter("encoding");// 读取web.xml文件中配置的字符集
		if (null != s && !s.trim().equals("")) {
			this.encoding = s.trim();
		}
	}

}

4.界面展示

1.主界面

2.查询

 3.到页数