Logic

import java.io.IOException;
import java.io.Writer;

import org.apache.struts2.components.Component;

import com.opensymphony.xwork2.util.ValueStack;
/**
*
* @parameter str：java.lang.String len：java.lang.Integer
* @说明：对字符串str进行判读，如果长度大于len，就截取len长度+“...”;打印结果
*/
public class SubStringLogic extends Component{


public SubStringLogic(ValueStack stack) {
super(stack);
// TODO Auto-generated constructor stub
}
private String str;

private Integer len;

    public boolean start(Writer arg0) {
boolean result = super.start(arg0);
        try {
//传入的字符串总长度
        int strtotlelen = str.length();
//title中显示原字符串
        StringBuffer stringBuffer = new StringBuffer(str);
        /*
        *  str 要截取的字符串
        *  len：截取的长度
        */
        if(str!=null){
        if(null!=str&&!"".equals(str)&&len !=null &&len>0){
        if(str.trim().length()>len){
        str=str.substring(0,len)+"...";
        }
        }
        str=transfer(str);
        //获得要换行的次数(默认每行20个字符)。
        int brCount = strtotlelen/20;
        if(brCount>0){
        int sub = 20;
        for(int i=0;i<brCount;i++){
          stringBuffer.insert(sub, "&#10;");
          sub+=20;
        }
        }
        String titleStr=stringBuffer.toString();
        arg0.write("<label title='"+titleStr+"'>"+str+"</label>");
        }
        } catch (IOException ex) {
        ex.printStackTrace();
        }
        return result;
    }

/**
* 对字符串转义，特殊字符转义。
*
* @param str
*/
public String  transfer(String instr) {
/*
* 对截取的字符串进行转义
*/
if (null != instr && !("".equals(instr))) {

// if(instr.indexOf("&")>-1){
// instr = instr.replace("&", "&amp;");
// }

if (instr.indexOf("<") > -1) {
instr = instr.replace("<", "&lt;");
}

if (instr.indexOf(">") > -1) {
instr = instr.replace(">", "&gt;");
}

if (instr.indexOf("\"") > -1) {
instr = instr.replace("\"", "&quot;");
}
//IE不支持&apos;使用十进制&#039;
if(instr.indexOf("'")>-1){
instr = instr.replace("'", "&#039;");
  }

if (instr.indexOf("\n") > -1) {
instr = instr.replace("\n", "<br>");
}

if (instr.indexOf("\r") > -1) {
instr = instr.replace("\r", "&nbsp;&nbsp;&nbsp;&nbsp;");
}

//if (instr.indexOf(" ") > -1) {
// instr = instr.replace(" ", "&nbsp;");
//}


}
return instr;
}

public boolean end(Writer writer, String body) {
// TODO Auto-generated method stub
return super.end(writer, body);
}
public String getStr() {
return str;
}
public void setStr(String str) {
this.str = str;
}
public Integer getLen() {
return len;
}
public void setLen(Integer len) {
this.len = len;
}


}