허니몬(Honeymon)의 자바guru

예제 코드 : 

HttpServletResponse response = (HttpServletResponse) ActionContext.getContext().get(StrutsStatics.HTTP_RESPONSE);
response.setContentType("application/octet-stream; charset=utf-8");
try {
    //다운로드되는 파일의 정보를 헤더에 추가하는 코드
    response.setHeader("Content-Disposition",
            "attachment; filename=" + URLEncoder.encode(item.getName(), "utf-8") + ";");
}
catch (UnsupportedEncodingException ignored) {
    // do nothing
}

HttpServletResponse response = (HttpServletResponse) ActionContext.getContext()
        .get(StrutsStatics.HTTP_RESPONSE);
response.setContentType("application/x-download");
try {
    HttpServletRequest request = (HttpServletRequest) ActionContext.getContext()
            .get(StrutsStatics.HTTP_REQUEST);
    LOG.debug("User-Agent : " + request.getHeader("User-Agent"));
    if(request.getHeader("User-Agent").contains("Firefox")) {
        response.setHeader("Content-Disposition",
                "attachment;filename=\"" + new String(item.getName().getBytes("UTF-8"), "ISO-8859-1") + "\";");
    } else {
        response.setHeader("Content-Disposition",
                "attachment;filename=\"" + URLEncoder.encode(item.getName(), "utf-8") + "\";");
    }
}
catch (UnsupportedEncodingException ignored) {
    // do nothing
}
response.setHeader("Content-Transfer-Encoding", "binary");
LOG.debug("Content-Disposition : " + response.getHeader("Content-Disposition"));
LOG.debug("Content Type : " + response.getContentType());

File file = new File(item.getPath());
FileInputStream fileIn = null;
ServletOutputStream outstream = null;
try {
    fileIn = new FileInputStream(file);
    outstream = response.getOutputStream();
    byte[] outputByte = new byte[8192];

    while (fileIn.read(outputByte, 0, 8192) != -1) {
        outstream.write(outputByte, 0, 8192);
    }
    outstream.flush();
}
catch (FileNotFoundException e) {
    LOG.error(e);
}
catch (IOException e) {
    LOG.error(e);
}
finally {
    try {
        fileIn.close();
    }
    catch (IOException e) {
    }
    try {
        outstream.close();
    }
    catch (IOException e) {
    }
}

Collections.sort(ipList, new IpListSortByIp());

public class IpListSortByIp implements Comparator<String> {

        @Override
        public int compare(String o1, String o2) {
            try {
                if (InetAddress.getByName(o1).hashCode() > InetAddress.getByName(o2).hashCode()) {
                    return 1;
                } else if (InetAddress.getByName(o1).hashCode() < InetAddress.getByName(o2).hashCode()) {
                    return -1;
                }
            }
            catch (UnknownHostException e) {
                //Exception 처리
            }
            return 0;
        }
    }

package javastudy.clazz;

import static org.hamcrest.CoreMatchers.*;
import static org.junit.Assert.*;

import java.lang.reflect.Field;

import org.junit.Before;
import org.junit.Test;

public class ClassTest {

    private TestMakeClass makeClass;
    private String FIELD_NAME = "fieldName";
    private String FIELD_ATTRIBUTE = "filedAttribute";
    private String MAKE_VALUE = "testMakeValue";
    private String MAKE_ATTRIBUTE = "string";

    @Before
    public void setUp() {
        makeClass = new TestMakeClass();
        makeClass.setFieldName(MAKE_VALUE);
        makeClass.setFieldAttribute(MAKE_ATTRIBUTE);
    }

    /**
     * private 접근제어 선언이 되어 있는 경우,
     * field.setAccessible(true) 선언을 해주면 접근이 가능하다. 
     */
    @Test
    public void testClassGetPrivateField() {
        
        Field field = null;
        try {
            field = makeClass.getClass().getDeclaredField(FIELD_NAME);
            field.setAccessible(true);
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }

        String fieldNameValue = null;
        try {
            fieldNameValue = (String) field.get(makeClass);
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
        assertThat(fieldNameValue, is(makeClass.getFieldName()));
    }
    
    /**
     * private 선언된 필드 정보를 가져오려고 하면 IllegalAccessExceptino이 발생함.
     * 
     * @throws SecurityException
     * @throws NoSuchFieldException
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     */
    @Test(expected=IllegalAccessException.class)
    public void testClassGetPrivateFieldThrowsEception() throws SecurityException,
    NoSuchFieldException, IllegalArgumentException,
    IllegalAccessException {
        
        Field field = makeClass.getClass().getDeclaredField(FIELD_NAME);
        
        String fieldNameValue = (String) field.get(makeClass);
        assertThat(fieldNameValue, is(makeClass.getFieldName()));
    }
    
    @Test
    public void testClassGetPublicField() throws SecurityException,
    NoSuchFieldException, IllegalArgumentException,
    IllegalAccessException {
        
        Field field = makeClass.getClass().getDeclaredField(FIELD_ATTRIBUTE);
        
        String fieldAttribute = (String) field.get(makeClass);
        assertThat(fieldAttribute, is(makeClass.getFieldAttribute()));
    }
    
    @Test
    public void testClassGetFileds() throws IllegalArgumentException, IllegalAccessException {
        Field[] fields = makeClass.getClass().getFields();
        System.out.println("fields size is[" +fields.length+ "]");
        
        for(Field field : fields) {
            //public 선언되어 있는 필드 정보만 나타난다. 
            String fieldValue = (String) field.get(makeClass);
            System.out.println(fieldValue);
            
        }
    }

    public class TestMakeClass {
        private String fieldName;
        public String fieldAttribute;

        public String getFieldName() {
            return fieldName;
        }

        public void setFieldName(String fieldName) {
            this.fieldName = fieldName;
        }

        public String getFieldAttribute() {
            return fieldAttribute;
        }

        public void setFieldAttribute(String fieldAttribute) {
            this.fieldAttribute = fieldAttribute;
        }

    }
}

  
package javastudy.simplexml;

import org.simpleframework.xml.Attribute;
import org.simpleframework.xml.Element;
import org.simpleframework.xml.Root;

@Root
public class Example {
    
    @Element
    private String text;
    
    @Attribute
    private int index;

    public Example() {
        super();
    }

    public Example(String text, int index) {
        super();
        this.text = text;
        this.index = index;
    }

    public String getText() {
        return text;
    }

    public int getIndex() {
        return index;
    }
    
}

  
package javastudy.simplexml;

import static org.hamcrest.CoreMatchers.*;
import static org.junit.Assert.*;

import java.io.File;

import org.junit.Test;
import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;

/**
 * simple Xml serialization 프레임워크를 이용하여 객체를 XML로 변환처리 테스트
 * @author 허니몬
 * 
 * 고려사항 : 
 *  1. Java 객체를 우선 정의해줘야한다.
 */
public class SimpleXmlTest {

    /**
     * Example 클래스의 구조를 example.xml으로 변환하여 xml파일을 생성한다.
     * 이때, 객체 안에 담겨있는 데이터는 @Attribute @Element 애노테이션에 
     * 의해 xml의 attribute와 element로 정의된다. 
     */
    @Test
    public void simpleObjectToXmlTest() {
        Serializer serializer = new Persister();
        Example example = new Example("Example message", 123);
        File result = new File("example.xml");
        
        try {
            serializer.write(example, result);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    @Test
    public void simpleXmlToObjectTest() {
        Serializer serializer = new Persister();
        File source = new File("example.xml");
        
        Example example = null;
        try {
            example = serializer.read(Example.class, source);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        assertThat(example.getText(), is("Example message"));
        assertThat(example.getIndex(), is(123));
    }
}

  

   Example message