过滤字符串中的Null和空格

StringUtil.java

public class StringUtil7 {
    private String sourceStr;//源字符串
    private String targetStr;//替换后的字符串
    public String getSourceStr() {
        return sourceStr;
    }
    public void setSourceStr(String sourceStr) {
        this.sourceStr = sourceStr;
    }
    public String getTargetStr() {
        if(sourceStr==null){
            sourceStr="";
        }
        sourceStr=sourceStr.replaceAll(" ", "");
        targetStr=sourceStr;
        return targetStr;
    }
    public void setTargetStr(String targetStr) {
        this.targetStr = targetStr;
    }
    
}

index.jsp

    

        

            

                
请输入字符串：
                

            
            

                

            
        
    

result.jsp

    <%
        request.setCharacterEncoding("utf-8");
        String sourceStr= request.getParameter("sourceStr");
    %>
    
    
    

        

            
过滤之前的字符串：
            

                
            
        
        

            
过滤之后的字符串：
            

                
            
        
    

21.PNG