相当强的分页，表格生成的JSP自定义标签

最新推荐文章于 2019-10-24 22:18:10 发布

zuzong

最新推荐文章于 2019-10-24 22:18:10 发布

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文章标签： jsp javascript string import null class

本文链接：https://blog.youkuaiyun.com/zuzong/article/details/1874864

本文介绍了一个自定义的分页控制器及表格生成标签，实现了基本的分页功能和表格自动生成。分页控制器能够根据当前页码、每页显示行数调整上下页和总页数等操作。表格生成标签则能够自动生成带有标题、编辑和删除按钮的表格。

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分页控制器（可能是这个名字），是仿主流论坛的分页做的，JS输入页码，半年前做着玩的的，有些东西记不太清了，反正里面好东西不少，难度适中，嘿嘿。。。

分页类：

import java.util.List;

public class PaginationMethod {

private int totalpage;

private int back;

private int next;

private boolean backbool;

private boolean nextbool;

private int thispage;

private int scrollrow;

public static List list;

private boolean error;

private int startpage;

private int endpage;

private int inputpage;

public PaginationMethod(int thispage,int scrollrow,List list) {

// TODO Auto-generated constructor stub

if(thispage<1)

this.thispage = 1;

else

this.thispage = thispage;

if(scrollrow<1)

this.scrollrow = 5;

else

this.scrollrow = scrollrow;

this.list = list;

}

//得到总页数

public int getTotalpage(){

this.totalpage = this.getListsize()/this.scrollrow;

if(getListsize() % scrollrow !=0)

totalpage++;

return totalpage;

}

public int getThispage() {

return thispage;

}

public void setThispage(int thispage) {

this.thispage = thispage;

}

//得到总行数

public int getListsize() {

// if(this.list.size()<1 || this.list==null)

// this.error = false;

return PaginationMethod.list.size();

}

// public void setListsize(int listsize) {

// this.listsize = listsize;

//}

//判断上一页动作是否会造成越界

public boolean isBackbool() {

if(this.thispage==1)backbool = false;

else backbool = true;

return backbool;

}

// public void setUppagebool(boolean uppagebool) {

// this.uppagebool = uppagebool;

// }

//判断下一页动作是否会造成越界

public boolean isNextbool() {

if(this.thispage==this.getTotalpage())nextbool = false;

else nextbool = true;

return nextbool;

}

// public void setDownpagebool(boolean downpagebool) {

// this.downpagebool = downpagebool;

//}

//执行下一页动作

public int getBack() {

if(this.isBackbool())

this.back = this.getThispage()-1;

else back = this.getThispage();

return back;

}

// public void setBack(int back) {

// this.back = back;

// }

//执行上一页动作

public int getNext() {

if(this.isNextbool())

this.next = this.getThispage()+1;

else next = this.getThispage();

return next;

}

// public void setNext(int next) {

// this.next = next;

// }

//起始页

public int getStartpage() {

if(this.thispage<0)thispage=1;

startpage = (thispage-1) * this.scrollrow;

return startpage;

}

public void setStartpage(int startpage) {

this.startpage = startpage;

}

//结束页

public int getEndpage() {

endpage = this.getStartpage() + this.scrollrow;

if(endpage>this.getListsize())

endpage = this.getListsize();

return endpage;

}

public void setEndpage(int endpage) {

this.endpage = endpage;

}

//JS输入的页码

public int getInputpage() {

if(inputpage>this.getListsize())

{inputpage = getListsize();}

else if(inputpage<1)

{inputpage = 1;}

else {inputpage = thispage;}

return inputpage;

}

public void setInputpage(int inputpage) {

this.inputpage = inputpage;

}

public int getScrollrow() {

return scrollrow;

}

public void setScrollrow(int scrollrow) {

this.scrollrow = scrollrow;

}

表格自动生成标签：

import java.awt.Color;

import java.io.IOException;

import java.util.List;

import javax.servlet.ServletRequest;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.jsp.JspWriter;

import javax.servlet.jsp.PageContext;

import javax.servlet.jsp.tagext.SimpleTagSupport;

import com.***.TableTagResult;//JDBC的结果集，返回List

public class TableTag extends SimpleTagSupport {

private String order;

private String update;

private String delete;

private String[] sqlparams;

private String[] css;

private String[] javascript;

private String style;

private String[] title;

private String classhtm;

private StringBuffer strbuf;

private List listrow;

private List listcol;

// private boolean title = false;

private boolean edit = false;

private PaginationMethod pm;

public TableTag() {

// TODO Auto-generated constructor stub

}

public void doTag() {

PageContext pc = (PageContext) this.getJspContext();

TableTagResult ttr = new TableTagResult("select * from roysched");

this.listrow = ttr.getTableResultRow();

this.listcol = ttr.getTableResultCol();

pm = new PaginationMethod(1, 5, listrow);

ServletRequest request = pc.getRequest();

String page = request.getParameter("pageID");

if (page == null || page == "" || page.length()<1)

page = "1";

char[] ch = page.toCharArray();

for(char n:ch){

if(Character.getNumericValue(n)>9 || Character.getNumericValue(n)<1){

page = String.valueOf(pm.getThispage());

}

if(Integer.parseInt(page) > pm.getTotalpage())

page = String.valueOf(pm.getTotalpage());

else if(Integer.parseInt(page) < 1)

page = "1";

pm.setThispage(Integer.parseInt(page));

System.out.println("pm.getThispage()====" + pm.getThispage());

pm.list = this.listrow;

this.update = "修改";

this.delete = "删除";

try {

JspWriter out = getJspContext().getOut();

// if(this.getJavascript() != null){

// for(String n:this.getJavascript())

// out.print("<script type="text/javascript" src=""+n+""></script>");

// }

out.print(this.getClasshtm());

if(this.getCss() != null){

for(String n:this.getCss())

out.print("<link rel="stylesheet" type="text/css" href=""+n+"">");

}

out.print("<div>");

out

.print("<table border="1" align="center" cellspacing="1" cellpadding="1" style=""+this.style+"" width="80%">");

out.print("标签生成的表格");

if (this.getTitle() == null || getTitle().length<0){

for(int i=0;i<this.listcol.size();i++){

// out.print("<th align="center" valign="middle">"

// + listcol.get(i));

// out.print("</th>");

out.print("<th>");

out.print("<input type="button" name="title" value=""+listcol.get(i)+"" />");

out.print("</th>");

}

}else {

for (String n:getTitle()) {

// out.print("<th align="center" valign="middle">"

// + n);

// out.print("</th>");

out.print("<th>");

out.print("<input type="button" name="title" value=""+n+"" class="but"/>");

out.print("</th>");

}

if (this.isEdit()){

out

.print("<th colspan="2" align="center" valign="bottom">"

+ "编辑");

out.print("</th>");

}

for (int i = pm.getStartpage(); i < pm.getEndpage()-1; i++) {

out.print("<tr>");

List list1 = (List) pm.list.get(i);

for(int j=0;j<list1.size();j++){

out

.print("<td align="center">"

+ list1.get(j).toString());

out.print("</td>");

}

if (this.isEdit()) {

out.print("<td align="center">");

out.print("<a href="#?updateID=" + i + "">" + update

+ "</a>");

out.print("</td>");

out.print("<td align="center">");

out.print("<a href="#?deleteID=" + i + "">" + delete

+ "</a>");

out.print("</td>");

// out.print("</tr>");

}

// if (this.getTitlebool()){

// out.print("<td colspan="" + this.colparams.length + 1

// + "" align="right">");

// out.print("</td>");

// }

if (pm.getTotalpage() < 2) {

out.print("<tr>");

out.print("<b>共1页</b>");

out.print("</tr>");

} else {

out.print("<tr>");

out.print("<td colspan=""+(this.listcol.size()+2)+"" align="right">");

if(pm.getThispage()>1)

out.print("<a href="temp.jsp?pageID=1" style="font-weight:bold">«</a> ");

if(pm.getThispage()>1){

for(int i=pm.getThispage()-2;i<pm.getThispage();i++){

if(i>=1)

out.print(" <a href="temp.jsp?pageID="+i+"">"+i+"</a> ");

}

out.print(pm.getThispage());

if(pm.getThispage()<pm.getTotalpage())

for(int i=pm.getThispage()+1;i<pm.getThispage()+3;i++){

if(pm.getThispage()==pm.getTotalpage()-1)

break;

out.print(" <a href="temp.jsp?pageID="+i+"">"+i+"</a>");

}

out.print(" …");

out.print(" <input type="text" name="inputpage" size="1" onkeydown="javascript: if(event.keyCode==13){location='temp.jsp?pageID='+this.value;return false;}" >");

if(pm.getThispage()<pm.getTotalpage()){

out.print(" <a href="temp.jsp?pageID=" + pm.getTotalpage()+ "" style="font-weight:bold">»</a>");

out.print(" Pages: ("+pm.getThispage()+"/"+pm.getTotalpage()+")");

}

out.print("</td>");

}

out.print("</tr>");

out.print("</table>");

out.print("</div>");

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

public String[] getSqlparams() {

return sqlparams;

}

public void setSqlparams(String sqlparams[]) {

this.sqlparams = sqlparams;

}

private String[] getTitle() {

return title;

}

private String createSql(String sqlparams[]) {

this.strbuf = new StringBuffer("select ");

for (int i = 0; i < sqlparams.length - 1; i++) {

strbuf.append(sqlparams[i]);

for (int j = i; j < i + 1; j++) {

if (j == sqlparams.length - 2)

break;

strbuf.append(",");

}

strbuf.append(" from ");

strbuf.append(sqlparams[sqlparams.length - 1]);

String sql = this.strbuf.toString();

return sql;

}

private String getSQL() {

String sql = null;

sql = this.createSql(this.getSqlparams());

System.out.println("getSQL()====" + sql);

return sql;

}

// public static void main(String[] args) {

//// String str = new TableTag();

// String str;

// int in;

// char ch;

// str = "1234567890";

//// in = Character.digit('g', 1);

//// in = Integer.parseInt(str,10);

// in = Character.getNumericValue('c');

// char[] cha = str.toCharArray();

// for(int i=0;i<cha.length;i++)

// System.out.println(Character.getNumericValue(cha[i]));

// }

public boolean isEdit() {

return edit;

}

public void setEdit(boolean edit) {

this.edit = edit;

}

public String[] getCss() {

return css;

}

public void setCss(String[] css) {

this.css = css;

}

public String[] getJavascript() {

return javascript;

}

public void setJavascript(String[] javascript) {

this.javascript = javascript;

}

public void setTitle(String[] title) {

this.title = title;

}

public String getClasshtm() {

return classhtm;

}

public void setClasshtm(String classhtm) {

this.classhtm = classhtm;

}

自定义标签的配置文件.tld

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"

"http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">

<tlib-version>1.0</tlib-version>

<jsp-version>2.0</jsp-version>

<short-name>tabletag</short-name>

<uri>/tabletag</uri>

<tag>

<name>tablebasic</name>

<tag-class>com.****.TableTag</tag-class>

<body-content>empty</body-content>

<name>sqlparams</name><！--这是个数组，放入数据库表的字段名和表名，没处理where，就为了意思意思-->

<required>false</required>

</attribute>

<name>title</name>

<required>false</required>

</attribute>

<required>false</required>

</attribute>

<name>javascript</name>

<required>false</required>

</attribute>

<required>false</required>

</attribute>

<name>style</name>

<required>false</required>

</attribute>

<name>classhtm</name>

<required>false</required>

</attribute>

</tag>

</taglib>

最后到web.xml注册一下就好了