1)在beetl.properties文件中配置tag

TAG.page = xx.xx.xx.xx.PageTag

2)在模板中引用標簽

3)增加標簽類繼承自GeneralVarTagBinding類

import org.beetl.core.Context;

import org.beetl.core.GeneralVarTagBinding;

import org.beetl.core.statement.Statement;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

public class PageTag extends GeneralVarTagBinding {

private int pageCount;

private int current;

@Override

public void init(Context ctx, Object[] args, Statement st) {

super.init(ctx, args, st);

Map pageMap = new HashMap<>();

Map val = null;

try {

val = (Map) getAttributeValue("val");

} catch (Exception e) {

}

if (val != null) {

pageMap.putAll(val);

}

if (pageMap.get("pageCount") != null) {

pageCount = pageMap.get("pageCount");

}

if (pageMap.get("current") != null) {

current = pageMap.get("current");

}

if (current < 1) current = 1;

}

@Override

public void render() {

StringBuilder obj = new StringBuilder();

//上一頁

if (current > 1) {

obj.append("上一頁");

} else {

obj.append("上一頁");

}

//中間頁碼

if (current != 1 && current >= 4 && pageCount != 4) {

obj.append("" + 1 + "");

}

if (current - 2 > 2 && current <= pageCount && pageCount > 5) {

obj.append("...");

}

int start = current - 2, end = current + 2;

if ((start > 1 && current < 4) || current == 1) {

end++;

}

if (current > pageCount - 4 && current >= pageCount) {

start--;

}

for (; start <= end; start++) {

if (start <= pageCount && start >= 1) {

if (start != current) {

obj.append("" + start + "");

} else {

obj.append("" + start + "");

}

}

}

if (current + 2 < pageCount - 1 && current >= 1 && pageCount > 5) {

obj.append("...");

}

if (current != pageCount && current < pageCount - 2 && pageCount != 4) {

obj.append("" + pageCount + "");

}

//下一頁

if (current < pageCount) {

obj.append("下一頁");

} else {

obj.append("下一頁");

}

try{

ctx.byteWriter.writeString(obj.toString());

this.doBodyRender();

}catch (IOException e){

}

}

}

總結

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